What will the UK do if Israel chooses to retaliate further to Iran?

On April 15 2024 Barry asked the Prime Minister:

“Iran sought to justify its unjustifiable attack on Israel on the basis that it was retaliating for Israel's attack on its consulate. I welcome the fact that the Prime Minister has said that in his telephone conversation with Prime Minister Netanyahu later today, he will be urging de-escalation. In that telephone conversation, will he set out the measures the UK will take if, in fact Israel seeks to retaliate further?”