The last I knew the council allowed BH to operate the GP circuit 24 or 25 days a year. After its race and internal needs are taken care of, the circuit make 9 days a year available to track day organisers...at 40 grand a pop.
They do run days there but not many as said. It`s my local circuit 5 minutes away and I have done three or four GP days there, check out Goldtrack and easytrack, both do them at circa £300. Worth every penny in my book.
pretty rare, but easytrack have done at least 2 sessioned and 1 open pit that i know of this year. you normally need to book well in advance but i couldnt even give away a few late places twice this year! WELL worth the effort/money to get the gp circuit.