Hi Steve
Sorry for the advertising tone of this post but ALUG is too good a source of technically adept people to not ask...
SyncNorwich is where you should be asking. syncnorwich.com
My company (http://proxama.com) are looking for a javascript guru.
We've got a /lot/ of javascript both front- and back-end. Node.js at the back and plenty of ember, jQuery etc on the front.
If you are one or know of one, please get in touch! I'm finding it very hard to get agencies to understand what I mean as they keep sending me CVs for 10-a-penny web developers when what I'm really looking for is A PROGRAMMER
Have you spoken to Jim Marshal at Ifftner?
I have a JavaScript guy who I know is looking atm. I'll send you his details off list.