The Met Office says the highest amount of rainfall recorded since the start of yesterday has been 164mm (6.4in) at Waterside Perth in Scotland.
But this is still way off the record, after some 238mm of rain was measured at Sloy Main Adit in Argyll & Bute between 9am on January 17, 1974 and 9am the following day.
This is the highest total on record in Scotland for what the Met Office calls a ‘rainfall day’: the 24 hours from 9am to 9am.
The highest equivalent total recorded in England is 279mm, on July 18, 1955 at Martinstown in Dorset, while the highest in Wales is 211mm, on November 11, 1929 at Lluest Wen Reservoir in Mid Glamorgan.
The highest in Northern Ireland is 159mm, recorded on October 31, 1968 at Tollymore Forest in County Down.
The highest total for any 24-hour period in the UK is 341.4mm, recorded from 6pm December 4, 2015 to 6pm the following day at Honister Pass in Cumbria.