I'm not sure, they had liveaboards at brighton which is also a premier marina?
We're as good as living on board as we're spending more time on than at home. (must cut the grass!!)
We lived on board at Shamrock Quay on the Itchen River in Southampton for two years with no problems. Other marinas that allow live-aboards are Quay Side Marine (Itchen River), Hasler Marina in Gosport (last time I checked anyway), Brighton Marina and Quay Lane Boatyard in Portsmouth harbour (if you can dry out in deep mud).