I seem to have fixed it by bleeding the radiators and flicked that switch next to the hot water tank that you can switch between hot water and heating.
Many thanks for your quick response, very much appreciated :D
I have an icos ideal boiler. My hot water is working but my heating will not work. When the hot water is on the c symbol is showing. When I switch the heating on it still shows the c symbol but does not fire up the heating.
Can anyone please advise???? :)