I have flown over many times but never called in. I did however ask them last time on the radio if they welcomed visitors - they said they did. I always felt it was an "unusual" field because it is not listed in most of the guides. In fact I think I even asked a question on here about the field some while back - it might be worth checking the search function.
Failing that the alternative is of course Bristol Filton albeit perhaps a little far from Bath.