If you wanna limit your plant to a foot tall, you'll really need to scrog or sog it (screen of green & sea of green - all involves putting a mesh above the plant & training it along the mesh instead of growing vertically). If you are definitely over 18, then check out UK420.com (over 18s only to register, they don't want schoolkids there) - it's the best UK growers board (and, no offence to this place, but IMHO the best growers board) on the net (and yes, that does include overgrow - sure they got some experienced growers there, but it's a corporate site, and there's far too many juvenile dickheads there). They've also got a store that sells seeds, and I can personally vouch for the quality, price & service (I've got 6 50/50 indica:sativa plants & 6 Blue Widow plants flowering from seeds purchased there as I type, 100% germination & only a couple of males).