Freedom Isn’t Free UK Personal Finance
Platforms
Best UK Investment Platform 2026: Broker Comparison
The wrong UK platform on a £100k pot quietly burns £400 a year. Over 30 years that's a new car you never bought. The right one is rarely the brand you've heard of.
Best UK investment platform by portfolio size
| Portfolio | Best pick | Cost model | Why |
|---|---|---|---|
| Under £20k | Trading 212 | Free | No fees on ISA, SIPP, GIA |
| ETF only, any size | InvestEngine | Free DIY | 0% platform, ETF OCF only |
| £20k - £100k mixed | AJ Bell | 0.25% capped | Funds plus shares range |
| £100k+ | interactive investor | Flat fee | Beats percentage on size |
Cost model matched to portfolio size matters far more than brand or app polish.
Key takeaways
1
The best UK investment platform depends on your portfolio size and what you want to hold, not on brand reputation.
2
Under £20k: Trading 212 or InvestEngine win on cost and simplicity.
3
Mid-sized portfolios (£20k-£100k) with mixed funds and shares: AJ Bell hits the sweet spot.
4
Larger portfolios (£100k+): interactive investor flat fees beat percentage charges by hundreds of pounds a year.