I read about this on MSE at the weekend and wanted to pass on the info Principality are offering a 5% 1 year regular savings bond to new and old customers with max contributions of £125 a month, called Christmas 2023. I opened one easily online then received a letter today with an activation code to activate the account and confirm my address.
After the year that'll be £1500 + interest, that'd be a nice chunk towards next years Christmas and Winter fuel bill or something more fun.