Planenut - thanks for your very quick response.
Car is a very early (chassis no.004) and doesn't have the NVH kit.
Bearing in mind I bought this car privately, I was given a set of loose papers(basic instructions) and service records - is this what you refer to as a handbook, or am I missing something else?
I will try to contact Bunny about the sprocket
No marks on or inside the tank - just checked the loose owners handbook and it says to read the dipstick (which doesn't exist) - will have to investigate further.
Once again thanks for your advice.
Regards
Andrew