Which? We reveal the best investment platforms in the UK
Mar 19, 2026
Megan Thomas, consumer journalist who breaks down investing behaviour and platform features. Josh Wolfson, senior data journalist who explains methodology, fees and rankings. They reveal top-rated providers and Great Value picks. They demystify ETFs, compare fee structures, discuss ISA rule changes and switching options, and warn about trading app traps and social media hype.
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Cash ISA Limit Drops But Stocks And Shares Stay At £20,000
- The 2027 ISA reform cuts the cash ISA limit to £12,000 but keeps the £20,000 overall allowance for stocks and shares ISAs.
- Josh Wolfson notes over-65s keep the £20,000 cash ISA limit and you can split allowance between cash and stocks and shares.
Plan To Invest For At Least Five Years
- Do treat investing as a long-term commitment of at least five years.
- Josh Wolfson advises planning to keep money invested for around five years to ride out volatility and aim for growth.
Ranking Based On Fees Customers And Asset Choice
- Which combined user survey scores, fee modelling and asset breadth to rank platforms.
- Josh Wolfson surveyed 3,000+ investors, modelled fees for different portfolio sizes and scored asset range to produce overall rankings.