Never visited. Looked into it once, but dissuaded by the landing fee - £47 for an EC120?? Cheaper (at least a little) to go to Redhill, which is much better equipped.
Personal view - don't mind if anyone disagrees:
If Blackbushe wants to attract volume traffic, perhaps using a separate landing fee for helicopters would be a good step forward. Helicopters don't need or use the expanse of ground that a fixed-wing uses to land, doesn't need that area to be expensively prepared into a runway, doesn't need PAPI or other expensive landing aids. Landing helicopters should be cheaper than landing fixed-wing; it is certainly less costly to the airfield. Sticking with a fixed-wing based weight chart for charges is the best way to keep heli visitors out.
Just me tuppence