I think, apart from the weather the school holidays have a big bearing on how business goes. This is why some girls will be busy and others quiet.
Schools in Scotland went on holiday around 26 June and things have been quieter since then. With both parents working now many guys have to take days off work to look after children and therefore can't visit, though I have had one guy turn up a while back with a child in his car. He was going to leave the child in the car while he got serviced.

. Fortunately having full view of his vehicle this was averted and he was refused a booking.
Schools in England have not long finished and the quiet time for them will probably be August as this is the full month schools there have off.
It's all a case of working out holidays etc and see if there is somewhere better you can be (if you can be bothered).
Edit : Just to say, HAVE English schools stopped yet. Just realised my mistake when reading over posts.