Time Out has a little list - try this link now (the underlying link is very long which is why I covered it)
Including a huge 10 metre menorah next to the Christmas tree in Trafalgar Square
and to quote what's planned on the weekend at Islington Green
"Free sufganiyot and massive menorahs are coming to Islington this weekend for the second-biggest public menorah lighting in the UK. Pop down to Islington Green to party to the sound of a live klezmer band, munch on latkes and have a go at spinning the dreidel. There are also craft sessions with Cass Arts and shadow puppet shows courtesy of Little Angel Theatre to keep your small ones happy.
Islington Green. Sun Dec 10.
Free."