its been months and months since i had my heating on, but now i've put it on i can smell gas… its one of them on the wall baxi things..
the heating all seems to work ok and when i switch it off the gas smell goes.

how dangerous is this, why? and any ideas what broke..?

If its natural gas (ie it smells the same as the stuff coming out of your cooker) the danger is . . . . it may go bang and kill you. No idea, but a CORGI registered installer should have one. Get it looked at by someone who knows what they are doing.

CORGI no longer valid
Gas Safe is where it's at now…

take up smoking, you'll soon find the leak.

i got candles burning, i dont like the gas smell..

i think i dont actually need heating though, i just put on some warm clothes, unfortunately she wont come round since i mentioned it lol so better get someone out to have a look damit!!

can't you just ring the helpline?

http://www.nationalgrid.com/uk/Gas/Safety/

did that last time i had a leak and the guy who came out just fixed it for free.

Don't use it, get the man out.