There's quite a crop, some of the ones I've seen so far
- Starling http://starlingbank.co.uk/ - Tandem https://tandem.co.uk/ - Loot https://loot.io/ - Fidor https://www.fidorbank.uk/ - Metro (been around a bit longer but still relatively new) https://www.metrobankonline.co.uk/ - Aldermore http://www.aldermore.co.uk/