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@Fran**
It's probably not the proper name for it, but they're basically a wooden chalet floating on the water, it was somewhere in Wroxham.  To look at them from the water they just look like a chalet on the side of the bank.  Doesn't have an engine though, the chalet stays in one place so they include a small boat with a little outboard on the back to go messing around in, you just moor it up right outside the porch on the chalet.

I think my parents were a bit worried about getting one of those cruisers because of the bridges, so doing it that way worked out ideal.  No problem getting under even the smallest bridge.