The controls are on, pilot light on but radiators not getting hot. I have been advised to top up the pressure. Where do I do this please?

Anita, December 2008

Thanks for your speedy reply. There are two tanks in loft. One with a stop cock. This looks OK. Is it adviseable to top this up further?
I have just knocked the pipes coming out of the boiler and this seems to have fired the boiler up and the radiators are getting hot but obviously this is not the correct scientific way to repair it!

Anita, December 2008

Gloworm ultimate is usually the boiler make
Depends what system is attached to it
Open system will have two tanks in loft
Sealed system will have expansion vessel and fill point

a, December 2008