I have also noticed the coloured areas in UK! Maybe it goes through academic cooperation?
@kravietz it may be the case data sharing arrangements between Met Office, KNMI NL, Méteo France and Met Éireann are currently unaffected by Brexit (as even gammons might realise that weather doesn't miraculously stop at national borders)
@kravietz interestingly it still contains UK data, although active involvement from UK Met Office appears to have been ceased (or scaled down) around 2019 and I can't find any info about whether the UK is still definitely an active contributor...