Iain
Full spectrum really between house right through hard house to some techno and some deeper Chicago house stuff used to be known as "Aduly Hoose" by a few of the Aberdeen pioneers!.
No garage and chart stuff etc
The mailing lists, you will need proof of gigs etc letters from owners, promoters stating how many you play too on a regular basis, and flyers
Keep hounding them and keep bombarding them with charts, letters and hassle
They will eventually put you on as a limited previewer and as you grow with regular returns and charts every week they will increase your limit.
Its hard work but really is worth it in the end.
Craig