In 2015, it seems to be ~2% (£200m/£12bn). This was general support for cash transfer schemes which included other features though, like nutritional support. Seems very high though still! Can’t see anything more recent—my naive guess would be its less than this now.
Link on UK spend 2011-15 on cash transfers.
Thanks! Yes this was just my impression from reading, not listening. I’ll hopefully get round to listening later and see if that updates my impression.