I realised as well as no hot water, there was now no heating, so I decided just to try the pressure valve using the screwdriver.
At first, the pressure guage never moved off zero, but then eventually I heard water return into the tank and the pressure gauge went up.....just took it to mid way in the grey area. Took a minute or 2. Will check it again over the next few days.
Would this have been related to me bleeding the radiators?
Cheers :)
Lindsey
September 2009