Right found one Stav - fitted it, and it seems to have worked!

Only seems to smoke now at very high revs when you get back on the pedal (like a tiny blow of smoke)

It only does that with a bang though so I'm asuming it's just unburnt fuel.

No other smoke, doesn't seem to be using oil, and it's had a fucking good hammering to see what the score is

Thanks Mate

thanks everyone else for advice too