Travelling in Israel you will meet Types C and H sockets, fed with 230 V at 50 Hz. At 230 V the supply matches what UK and European appliances expect, so no converter is needed.
The same socket system is used in Palestine, so one adapter covers all of them. Watch out when moving on: Hong Kong, Oman and Saudi Arabia use a completely different system. In Asia, 2 of 50 recorded destinations use exactly this combination.
Protective earth
Grounded and ungrounded sockets may occur
Not every socket in Israel is earthed: Type H yes, Type C no. Class I appliances belong in an earthed outlet.