Sprive is a free app that offers money back from gift card purchases that pays towards your mortgage. They also help you set money aside by letting you do a one off top up or setting up an auto save direct debit payment that can be paid towards your mortgage. This can be fixed, variable or turned off if you don't want it. They also host various mortgage offers on their app if you're interested in seeing what you might want to remortgage to.
Sign up with my code E73JYBUX, get Sprive Plus for free, and be in with a chance to win your next mortgage payment.
Here's the link to download:
https://linkprod.sprive.com/refer?code=E73JYBUX