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The more I read the more I think the amount of engagement is the issue. I think I'll try the half link first as it is the cheapest and easiest.
It only happened a couple of times on the way home and again only when setting off (and even then not every time). I couldn't replicate it when I wanted to so I'm guessing it is borderline. Even Gipsy Hill couldn't make it slip.
However, yesterday's and today's times up GH were both 5 seconds off my Strava PR for GH considering it's been about six months since I tried it on one gear so I'm still really happy with the bike.
stevo_com-
What's the freewheel and how old is it? I found my old(ish) shimano freewheel would skip what felt like a few links at a time as it got older.
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I had the same problem you describe on a singlespeed set up with a chain tensioner. I could change the way it tensioned so setting it up to push the chain in rather than out solved the issue.
hamrack
andyp
One of the presenters on Mountainbike Radio (on either "Just Riding Along" or "The Path"[bikeshop show]) reckoned that proper SS cogs only really work with pre-set chain tension (i.e track ends, sliding dropouts, EBB). He said that if you're using a sprung tensioner, you need teeth shaped more like cassette sprockets to avoid chain jump.
The easiest option will probably be to get as close to a magic gear as you can, with the tensioner acting as insurance and accounting for a bit of chain wear.