Thanks guys, bit dark now to get a photo, but i'll try get one tommorow.
Blumby; The markings say it's a "Victa V50". From what i understand it's a plastic carby that you mount at a 45degree angle then lock on by twisting it.

Tiger; i've checked the diaphram and it has a little give either way but does not allow continuous flow-through, which is good from what i've read.

Picture tommorow afternoon hopefully smile

Thanks for the replies so far!