UK abstained. Article doesn’t seem to mention the third non-supportive member of the security council.
Title of the article is “US vetoes UN’s call for ‘humanitarian pause’ and corridors into Gaza”
"But the US ambassador to the UN, Linda Thomas-Greenfield, said the resolution, carefully crafted by Brazilian diplomats, was unacceptable because it made no mention of Israel’s right to self-defence. The UK abstained, saying the resolution lacked mention of the way Hamas was using ordinary Palestinians as human shields."
Note that the initial attacks by Hamas were deemed off-topic here...