try base-camp.co.uk, but for a whole burner I think they are usually around £80.
do you really need brand new ones? you can replace all the moving parts for about £20-25 per burner. unless the passages in the burner are blocked an entire replacement shouldn't be necessary...
-------------------- nothing-absolute nothing-half so much worth doing as simply messing about in boats.
"I'm as honest as the day is long // the longer the daylight the less I do wrong"