In reply to Polhemic:
not been to the wall in centre of soton for a while so not sure about the routes etc, but from what i remember it was about £3 but was just a converted squash court so pretty small.
I recently looked at the calshot site and saw that it is charging more than £7, and that was for concession members, more if not! I think that is pretty obscene... and after the petrol to get all the way down to where the wall is and the cost of entry, if the weather is good you are better off driving another 50 mins and going to swanage for the evening for the cost. if you have the time that is...