I am now nearing my fixed wing ppl at long last, but I have had a couple of goes in the whirly machines. Best way of summing it up is "the most fun you can have with your clothes on!!" (certainly for a whole hour anyway).
I fly fixed out of Sheffield City, and Alpha come well reccomended. However owing to the "nimbys" locally, especially the lady that took exception to flying ops on Easter Sunday, the village of Treeton is now pretty much a no go area. So your approach back to the field will seem to be a bit "round the houses", indeed talking to a heli instructor today who tells me that he has now taken EGSY off his places to send students list because of this.
Sheffield has a great location though, to get the most out of the experience, ask about a trip round the dambusters route. The resevoirs where 617 squadron practiced are close by and by all accouts the heli trip down the water is fantastic. Not only will you get to experience heli flying but also be able to see a bit of our great aviation history as well. That is my two penneth anyway.