Jerseys a nice place.
I had to go there on a business related matter, and was really impressed so going to make a trip there sometime soon!
I was at the Hotel De France, apparently the Spa is one of the most beautiful in the world (which it does look very nice!), but the rooms and corridors etc were a bit old fashioned and dated.
On a side note, if you are willing to pay 250 a night, I'd personally go to Barcelona, or Rome or something like that and budget it airline wise and spend a few days abroad in a nice hotel as they are cheaper than in the UK at the moment!
I took my girlfriend away to Rome for 5 nights for about 500 quid, including flights. But its expensive once you get there!