By Lars Mucklejohn The UK’s major banks are muscling into new areas of the fintech space as they look to keep up with a pack of young challengers and grab a slice of the lucrative market. In the early 2010s, a wave of financial technology start-ups burst onto the scene offering new products and slick alternatives to traditional banking. They have since attracted millions of customers, eye-catching valuations and are becoming increasingly profitable, forcing incumbent firms to reconsider their models. Fintech is growing across banking, payments, insurance, wealth management, digital assets and …