So today I took him out for a run, I put the choke in quite quickly. Everything seemed to be fine, however when I got back things were quite lumpy again (with no choke) at idle. Pulling a little bit of a choke seemed to stop that (a fingers width), as did manually revving things a bit. Any ideas?
I guess renewing all of the ignition service bits might be an idea?
Also, I noticed that it's losing oil from the back of the sump. There was a patch on the garage floor when I returned. That seems a bit worrisome, especially the comments people said about burning oil.
I can't say I noticed a high amount of smoke today (be it blue or otherwise), but maybe it's subtler than I'm imagining.
They could be two unrelated problems of course.
Thanks people