Brother announced that 2023 is the wettest year he has recorded, in what I think is an amalgam of records from the Essex Water Company starting around 1960 at Hanningfield Reservoir treatment works, and, since he retired, his garden, about 3 miles away in Ramsden Heath. 2012 was the previous wettest.
He tells me that 2012 was also the wettest year on record at the Radcliffe Observatory in Oxford, whose records began in 1797 or thereabouts. Their data seems to be available in arrears - so far as I can tell, the latest data available on their website is up to April 2022, which can be downloaded as a .csv. It's a big file because there are a lot of days in 220 years.