Which Dragon's Den investor founded the digital bank Monzo?

Tom Blomfield founded the digital bank Monzo.

Blomfield is a British technology entrepreneur who co-founded Monzo, a mobile-first bank originally launched under the name Mondo. The company became known for app-based current accounts, instant spending notifications and brightly coloured payment cards.

He later appeared as a guest Dragon on the British programme, bringing specialist experience in financial technology and start-up building. His background differs from investors whose careers were primarily in retail, leisure or conventional consumer products.

Monzo is often confused with Revolut because both are prominent British-founded fintech companies. The question asks specifically for the founder connected with Dragon's Den, and that investor is Tom Blomfield.