If you want to go to a proper fisherman's playground take a look at Avon Springs.
Take a look at me blog the thread called Trip to Favourite Avon Springs 29.06.10 on first page where Dabhoy and I fished recently.
Top rainbows are there in the lakes with grayling, brownies and dace in the river all just down from the historic bit of the Avon of Frank Sawyer. It may fit in with what you are looking for.

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PS PM me if you want some more Birthday Ideas as I may not be able to print them here!