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.