I'd recommend Tide... they've not done much recently but it seems they were setup with only £2m initial funding and they've just secured another £14m on top so I'd expect them to start releasing new features soon.
We have had numerous problems
- crazy login processes involving receiving OTPs via post after 5 days
- waiting 2 weeks to receive cards
- slow and unhelpful support responses
- failure to follow up with responses to issues after promising to do so
- poorly built non-platform-specific app - not sure how they made it
- still no multi-user support
- even a case where our balance didn’t match the sum of our transactions, the issue was acknowledged, and now - after 6 months - STILL has not been resolved
At present, there is no remotely decent option for UK business banking. It’s a shame.