Ticked her over again today and still had a bit of trouble getting her to purr nicely. Infact I couldn't get the bloody thing to stay running at all. Then after a closer look, I found some more evidence of a dodgy service job. The fuel line out of the tank was kinked in 2 spots because it was cut too short (or they just used a cheap and nasty peice of tubing). I don't think that was helping the problem. I've managed to do a quick fix for now by turning the fuel tank around. The pull cord also broke a couple of times.