There is no verified evidence from credible sources that the UK has announced a boycott of diplomatic relations with Israel due to the Gaza war as of the latest available information.
Breaking: UK says it will boycott diplomatic relations with Israel due to its war in Gaza.

FactVerify
Source: factverify.com
Key Evidence
Recent live updates and summaries of international responses to the Gaza war do not report any UK government announcement to boycott diplomatic relations with Israel. No official UK statements or credible news reports support this claim.
dawn.comdawn.comLive Updates: Israel's Gaza invasion - Day 652
en.wikipedia.orgen.wikipedia.orgGaza war
What the Evidence Shows
The claim asserts that the UK government has declared it will boycott diplomatic relations with Israel because of the ongoing conflict in Gaza. A review of recent and authoritative sources, including live updates on the Gaza conflict and comprehensive summaries of international diplomatic responses, does not confirm any official UK government statement or policy indicating a boycott of diplomatic relations with Israel.
While the conflict has indeed caused significant international diplomatic reactions and some countries have taken legal or political actions, no credible reports or official announcements from UK government sources or major news outlets corroborate this specific claim. The search results provided include general updates on the Gaza war and mention other countries' diplomatic actions but do not mention the UK boycotting Israel diplomatically.
Given the high-profile nature of such a diplomatic move, it would be widely reported by multiple reliable sources if true. Therefore, without corroborating evidence, this claim remains unverified and should be treated cautiously until confirmed by authoritative sources.