Thanks both
We bled one of rads, as suggested, and got the pressure down to below 2 but when we put the heating on it shot up again, however not to 3.3 as it was before. We're cooling it down again and will continue to bleed it later. We'll take it to 1 bar and see what happens after that...
My husband bled the bathroom radiator yesterday and it's affected our boiler. We noticed the pressure was well below 1bar so he opened the pressure valve to get this up. Now it's reading 3.3 so I've turned the heating off to see if it will drop. What's the best advice - other than calling a...