Tensioned up the chain again this evening to make everything a bit tighter, and went for another short spin. This time I tensioned the chain with the chain ring slightly off the tight spot, so the chain is probably a tad too tight in the tight spot, but looks much better most of the way around. Interestingly it seems to have loosened up a teeny bit during the ride - is this normal with new chains? Or perhaps I'm just being paranoid, it's quite hard to quantify how much play there is in the chain by hand and I think both my chain ring and sprocket are slightly out so might just be testing different points.
Anyway, the chain stayed on this time, and I had a lovely ten mile or so spin through the local quiet country lanes. I enjoyed the feel of the tighter chain line too, with a more immediate switch between putting in power and resisting going downhill. I had one moment going down a slightly iffy blind corner where I automatically tried to freewheel on applying the brakes, which was a little bit interesting - wouldn't like that to happen at 180+rpm though! The bike feels really nice to ride, and is very rewarding of a good hard grunt on the pedals. It's definitely a slightly racier fit than any of my other bikes. The saddle is also really quite comfy so may end up keeping it on the bike (it's not quite period correct, think it's a 1970s Selle Italia
Condor, but still a nice saddle, and goes with the black and yellow paint job quite nicely).
I think I'm beginning to get what this fixed malarky is about
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Will do another short spin over the weekend (well my weekend, which isn't at the weekend at all, but Mon/Tue anyway) and then tighten up the cotter pins and see how the chain tension's holding up. Then planning on taking the bike down to Exmouth for a (mostly flat) 40ish miler to see how I get on with it on a slightly longer ride.
@biggs682 what are you planning on using for your fixed gear makeover? I can see how they'd make a great winter bike, but I have to be honest, if I was commuting day in day out on one I would really, really, really miss having gears.