Thank you so much for your reply I eventually had to call out a plumber because I couldn't find the valve. I was looking all over the boiler.
I couldn't find a plumber that would come out on Hogmanay, I eventually found one, he wanted paid double time for a public holiday. I was stuck and my pipes would have frozen in the subzero temperatures so I agreed.
He arrived opened the cupboard under the boiler, and hand opened a valve, the pressure went back to 1.0 bar he closed it took £100 and left.
It took him literally 2 minutes.
I was looking too hard to find the valve on the boiler, I never thought to look in a cupboard near the boiler.
The ideal service manual or guide dosn't help at all, it only said the installer should show the user how to repressurise the boiler when handing over.
It's a new house I wasn't shown where this valve was, how was I too know?
I searched the whole net and I couldn't find any advice on something so simple.
I can only hope this saves someone else money.
For those searching for help on this subject heres a few keywords to find this info:-
no pressure ideal boiler combi gauge central heating not working help zero 0 bar bleeding bled radiator radiators air punch greedy plumber
Please remember if you have just moved into your first new build house and have decided to bleed your radiators the pressure will drop on your combi boiler and your heating will not work.
To repressurise look for a valve on a length of flexible hose on or near your boiler this may be hand opened or opened with a flat headed screwdriver.
If you can't see this hose and valve on your boiler look near your boiler, under the kitchen sink, or in a cupboard below or around your boiler.
In my case it was a blue plastic valve attached on to a u-bend length of flexi hose in a cupboard directly below my boiler that could be opened an shut by hand.
I bet this story gets a few laughs off a few plumbers.
Thanks for your advice anyway,
Cheers
Jamie