Source is here: https://yougov.co.uk/topics/politics/survey-results/daily/2025/02/20/c33bd/1
That source allows you to see the results according to political affiliation. Pluralities of supporters of the Conservatives, Labour, and Lib Dems think that supporting Ukraine is more important.
The exception is Reform UK, whose supporters think that good relations with the USA are more important than supporting Ukraine.
Trump may be temporary, but the oligarch fascists flocking around him have realised how blatant they can act without facing any repercussions, and they will not relinquish this overt control of political power again, regardless of which president wins.