Dont put gravel in,youve got to get all the bits out then.Use diesel or parrafin,and an old chain,pushbike,or even better chainsaw.All you need to get it out is a coathanger,or some other bit of hooked wire.Comes out all in one hit.Put that in the tank with a couple of pints diesel/parrafin and give it a really good shake,turning it so you get all round inside.

ok update
cleaned the jets so they all nice an clean an clear but.....
still wont frickin start could well be the battery but she also wont bump start any thoughts have got some one comin round with jump leads but still any advice would be amazing
cheers
Ben

update once again

ok so was out there 2night tryin to start her then started talkin to about a mate an he surgested compression then i remebered there was petrol pissing down the vaccume pipe which goes straight to the head so petrol in my FCUKING oil

Ben