Sir Terence Etherton, the incoming Master of the Rolls, told Reform Judaism's annual dinner of his pride in being a Reform Jew.
"The first day it was possible, I had a same sex marriage to my partner of 39 years [at West London Synagogue]. How proud and thankful I was to be a Reform Jew and a citizen of this country on that day."
More than 220 supporters attended the dinner at a central London hotel on Tuesday.
Proceeds will go towards key initiatives showcased on the night - re-imagining leadership; adult social care and promoting and empowering Jewish practice.
The themes were identified in close consultation with congregations.
Reform Judaism plans to purchase minibuses to help tackle social isolation, particularly among the elderly. It also intends to develop adult education programmes and leadership training.