Thanks for the advice,
Its retired to the drive till Saturday when I can really have a good look at it. I will check all components and change out what I can/where it's needed.
When I ran it last night I noticed that the sound of the engine was off. There was a kind of knocking/rattle/breathy noise coming from the middle to rear of the engine and a strong smell of fuel when the engine is running. I'm going to have a look at the fuel pipes as well but if there is anything else worth looking at I would appreciate a pointer! Thanks again.