right i understand now, admittedly i was a bit hasty and failed to read the info at the top of the forum. so to ensure i provide most of the required information i'll try again, however i am not at home so may have to come back to some of these.
1) Boiler make / model (gas or oil)
GAS BOILER, DO NOT HAVE MAKE AT HAND.
2) What is / is not happening
HAVE HOT WATER BUT NO HEATING, WHEN HOT WATER IS RUN, THE LITTLE RADIATOR LIGHT FLICKERS ON AND OFF BUT SOON GOES OUT, RADIATORS DO NOT GET HOT OR EVEN WARM.
3) Has ANYTHING else been done / changed recently
NOTHING HAS BEEN CHANGED, I HAVE NOT USED THE CENTRAL HEATING FOR APROX ONE WEEK.
4) When did it (problem) start
NOTICED YESTERDAY EVENING, WHEN RADIATORS FAILED TO HEAT UP.
5) When does it happen? eg, heating coming on or going off
HEATING FAILS TO COME ON WHEN SWITCHED ON.
6) Anything else you feel may be of relevance
BOILER 18 MONTHS OLD, RADIATORS MAYBE AT LEAST 20 YEARS OLD.
please excuse the use of capitals, these are not being used to constitute shouting. i appreciate any help.