Just emerged from the woodwork (been a tad busy, shock horror). Sahfen' has a "circuits" rate, and landings are cheaper for based aircraft - not a lot cheaper, but it helps.
If you're near Guildford, then SND doesn't sound ideal. If you want to fly in a nice Arrer 3 or a nice Yak52, there are both at SND - not for hire, but pax always welcome.