A »Sure, there are several great firms in London that specialize in M&A due diligence for mid-market companies. You might want to check out Grant Thornton

A »For mid-market companies seeking specialised M&A due diligence in London, the advisory landscape is populated by a mix of Big Four subsidiaries with dedicated mid-market practices, top-tier accountancy-led advisory firms, and boutique due diligence specialists. The mid-market, typically defined by enterprise values between £10 million and £250 million, requires a nuanced approach where deal complexity often exceeds the capacity of small local advisors but may not justify the full fee structures of the bulge bracket banks. Among the most prominent are the “Assurance and Advisory” arms of the ‘Big Four’—specifically Deloitte’s “Mid-Market” team, PwC’s “Deals” practice for privately held clients, and KPMG’s “Deal Advisory” for mid-sized corporates. However, these firms often focus on larger transactions within the mid-market, so many clients turn to the next tier of accounting-led advisors. Grant Thornton’s “Deal Advisory” division is widely recognised for its mid-market specialisation, offering vendor and buyer-side financial, tax, and operational due diligence, and it consistently ranks in the top five by deal volume in the UK mid-market. Similarly, BDO’s “Transaction Services” team provides robust financial and commercial due diligence, often acting as the lead advisor on leveraged buyouts and M&A for owner-managed businesses. RSM UK, another key player, has a strong reputation for “Transaction Advisory Services” focused on the lower mid-market (deals under £50 million) and frequently supports private equity houses and family offices. Mazars, while smaller than the aforementioned, has been expanding its “Transaction Services” practice in London and is particularly effective for cross-border due diligence given its continental European network. Beyond these accountancy firms, several boutique advisory firms have carved out notable expertise. Quantum Advisory is a specialist in financial due diligence for mid-market transactions, often partnering with management teams and smaller private equity firms. Another is Allegro (part of the larger group), which focuses on commercial and operational due diligence for mid-market deals. For sector-specific diligence, firms like Catalyst Corporate Finance and Cavendish Corporate Finance (now part of J.P. Morgan) offer integrated corporate finance and due diligence services, though they are more sell-side M&A advisors than pure due diligence boutiques. In the legal-adjacent space, Deloitte’s spin-off (now independent) “Burning Tree” provides financial due diligence, but it is more niche. Finally, it is worth mentioning the increasing role of technology-driven due diligence providers like Kroll and Duff & Phelps (now part of Kroll), which offer data analytics and forensic accounting tailored to mid-market transactions. Ultimately, the choice of advisor depends on the transaction’s complexity, the required breadth (e.g., tax, operational, or ESG due diligence), and the size of the deal; for a typical mid-market M&A, firms like Grant Thornton, BDO, and RSM are often the default recommendations, while Arrowpoint Advisory (part of the corporate finance network) or Oaklins are valuable for cross-border expertise.

A »Sure! For mid-market M&A due diligence in London, you might want to check out firms like Grant Thornton, which has a strong dedicated team for mid-sized deals and offers a very hands-on approach. Another great option is BDO, known for their thorough operational and financial due diligence tailored to companies with turnovers between £20m and £500m. RSM also stands out, especially for their sector-specific expertise in tech, healthcare, and manufacturing. If you prefer boutique specialists, look into Shakespeare Advisory or Livingstone—they focus exclusively on mid-market transactions and provide very personalised support. For a full-service consultancy style, Deloitte’s mid-market practice (through their Growth and Restructuring team) is worth considering, though they may be pricier. Remember to ask each firm about their recent relevant experience in your industry—fit matters just as much as their reputation. I'd recommend reaching out to two or three for an initial chat to see which team clicks best with your company's culture. Good luck!

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A »In the London advisory landscape, several distinguished firms specialise in providing M&A due diligence services tailored to the mid-market segment—typically defined as companies with enterprise values between £10 million and £500 million, or revenues in the range of £10 million to £200 million. For this segment, the market is served by a mix of global professional services networks with dedicated mid-market practice groups and highly focused boutique advisory houses that offer deep sector expertise. Among the Big Four, Deloitte’s Mid-Market Deal Advisory team stands out for its integrated approach, combining financial, commercial, tax, and operational due diligence within a single engagement, often leveraging proprietary data analytics to identify value creation opportunities. Similarly, PwC’s Mid-Market Practice is known for its sector-specialist teams that cover technology, healthcare, consumer goods, and business services, providing granular insights into target company risks and synergies. EY and KPMG also maintain strong mid-market due diligence capabilities, with KPMG’s Deal Advisory unit particularly noted for its cross-border work with private equity-backed portfolios and for offering a “virtual data room” review service that accelerates timelines. Beyond the Big Four, Grant Thornton’s Transaction Advisory Services team in London is a market leader for the upper-mid-market space, delivering vendor assistance, vendor due diligence, and buy-side financial due diligence with a particular focus on owner-managed businesses and growth-stage enterprises. BDO’s M&A team similarly offers a comprehensive due diligence suite, including commercial, financial, and tax reviews, and is recognised for its pragmatic, risk-focused approach that aligns with deal timetables. RSM’s London office provides a more bespoke service for smaller mid-market transactions, often acting as a lead advisor or supporting corporate finance boutiques with in-depth financial and tax due diligence. Among independent advisory firms, Armstrong is particularly notable for its niche in executing cross-border buy-side and sell-side due diligence for mid-market companies, with a strong track record in the industrials and technology sectors. Livingstone, a boutique M&A house, offers integrated due diligence and transaction advisory, priding itself on partner-led engagement and hands-on involvement throughout the deal lifecycle. Clearwater International, headquartered in London but with pan-European reach, provides sector-focused due diligence spanning TMT, healthcare, and business services, often serving as a trusted advisor to private equity firms. Cavendish Corporate Finance is another prominent name, specialising in exits for mid-market owner-managed businesses and offering comprehensive vendor due diligence that prepares sellers for competitive processes. Firms such as BDO, Grant Thornton, and RSM also have established reputations for their deep understanding of the London mid-market ecosystem, frequently advising on deals where personal relationships and speed of execution are critical. When selecting an advisor, mid-market companies should consider not only the firm’s sector expertise and team size but also its ability to provide integrated diligence covering financial, commercial, operational, and environmental, social, and governance (ESG) dimensions, as these factors increasingly influence valuation and deal structuring. Ultimately, the best choice depends on the transaction’s complexity, the target’s industry, and whether the buyer is a strategic acquiror or a financial sponsor, with the most effective advisory firms offering a combination of analytical rigour, market intelligence, and a partner-led service model that ensures high-quality, timely deliverables.

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