Thanks, Sparks. I haven't tried it yet since I will have to forage a
way to the control panel first. What I really wanted to do was to
re-wire the Control Panel so as to disable the SAB permanently rather
than as a one-off. I could call an installer but he is going to charge
me £50 or so as a call out charge for 5 minutes up a ladder and I
baulk at that. Anyway - Many thanks and I'll either give it a go or
chicken out. Eric