Britain has threatened to expel one Israeli diplomat for every British diplomat forced out of Israel if Jerusalem follows through on closing the UK consulate in East Jerusalem this Thursday. That could mean up to 27 Israeli diplomats sent home — a scale of expulsion more commonly associated with British-Russian relations than with a nominal ally. The trigger is Israel's retaliation against the UK's decision to ban trade in goods from illegal Israeli settlements in the occupied West Bank and to sanction British firms that facilitate settlement construction. Israel's foreign minister, Gideon Sa'ar, called the UK move "morally distorted" and accused the Labour government of hostility. The consulate, located in Sheikh Jarrah, is distinct from the Tel Aviv embassy and covers East Jerusalem, the West Bank, and Gaza — territory the UK and most UN members consider occupied Palestinian land. The legal stakes are sharper than they appear. Former UK attorney general Dominic Grieve has advised the Foreign Office that Israel is acting unlawfully by closing the consulate, because East Jerusalem's status under international law does not grant Israel the authority to expel diplomatic missions sited there. Western diplomats from other countries are openly worried about the precedent: if Israel can shut a consulate in occupied territory to punish a policy disagreement, every mission in Jerusalem is vulnerable. UK national security adviser Jonathan Powell flew to Jerusalem last week to negotiate a deferral and failed. Reports indicate Powell opposed Foreign Secretary Ed Miliband's settlement trade ban in the first place, fearing it would hand Netanyahu a domestic political gift ahead of Israel's 27 October election. There is no evidence yet that the UK decision has moved Israeli voters, but a full diplomatic expulsion exchange would almost certainly change that. Israel is not limiting its retaliation to Britain. The Netherlands has had its diplomats' credentials to Palestine revoked over a similar settlement import ban. France and Canada, which joined the same trade ban, have not yet faced consequences — a selective escalation that looks designed to test how far individual governments can be pushed before others fall in line. Miliband received a warm reception at the Labour conference for his stance and has spoken of evidence of war crimes in Gaza, though he has declined to use the word genocide, reserving that determination for international courts. UK-Israeli relations have deteriorated steadily since Hamas's 7 October 2023 attack, as Britain rescinded arms export licences and grew increasingly critical of Palestinian civilian casualties. The underlying question is whether a country exercising military occupation can use diplomatic accreditation as a weapon to punish allies who enforce international law. If the consulate closes and the expulsions follow, the immediate damage is bilateral. The long-term damage is to the entire framework of diplomatic access in contested territory.