Peer-to-Peer (P2P) is one of several functions that were amalgamated under the Google Pay name in 2018. It has still been available in the UK market, however, and allows users to send payments to others using a balance stored in a relevant account. Unfortunately, Google has announced that it is suspending this ability in September 2019.
https://www.notebookcheck.net/Google-will-terminate-its-UK-P2P-service-later-in-2019.424785.0.html
Google has a shameful history of taking over useful third party services, harvesting its users and data and then closing them down. I hope someone soon does the same to Google itself.