Lowtimer,
The British Gliding Association [
www.gliding.co.uk/]
and the British Aerobatic Association [
www.aerobatics.org.uk/] can both steer you in the right direction.
Alternatively, here's a couple of parachute manufacturers' website (presumably they can provide contact information for your local distributor):
www.strongparachutes.com/emerpara.html
www.nationalparachute.com/
I hope that helps.
MLS-12D