on tick over the revs pop from 900 to 1500rpm with strong smell of petrol and small amount of smoke. if you keep revs at 1000rpm it slightly splutters higher revs it clears and drives fine any help would be great! thanks

 

Could be a dicky plug, or a leaky injector.
tabetha

 

and how would i check them for problems?

 

Try a new set of plugs, around £10 for some 071, try getting the injectors cleaned, sounds more like a injector, but lots of other things it could be, have you checked the fuel pressure/pump voltage, when was the filter last changed etc etc.
tabetha

 

plugs were changed last month using pfr7b ngk. Filter unsure