We are not of course comparing like with like. 2017 was a General Election, while 2026 are local elections in England and national ones in Scotland and Wales.
However psephologist John Curtice has noted that Reform is polling well in areas which voted for Brexit. 2017 was of course the first post Brexit vote election. Labour was clearly better at winning the support of Brexit voters in that year that it has been, with a different strategy in 2026
Kmflett's Blog 
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