Am I being thick - Blow torch

[PaulStat]

I just bought one of these, I've screwed it all together, turn the gas on I can hear the gas escaping but I can't seem to light the gas every time I take my lighter to it it blows it out, I tried lighting it on the lit gas hob but it just seems to blow the flames.

http://www.wickes.co.uk/Blow-Torch/invt/159891

 

[PaulStat]

thanks guys, turns out I'm having a thick evening, once I figured it out I screwed the metal bit off to put it away, luckily it occured to me fairly quickly that this had actually punctured the gas canister and I was now leaking gas all over the place. DOH!