In 2005 the BBC reported that in 1958 the UK provided Israel with one of the critical ingredients needed to build a bomb. Citing recently declassified documents, the BBC said that 20 tons of heavy water were sold to Israel, without the knowledge of the US. This was almost certainly a critical factor in Israel being able to build nuclear weapons.
Israel is now the world’s fourth largest arms trader, and has one of the world’s largest and most effective military. Britain has a long history of supporting the Israeli military, most recently by making an 800 million pound sterling purchase of Israel drone technology, under the Watchkeeper system.