Someones been a lucky boy! I had the back wheel off my fixed and in the LBS to have its bearings replaced, sealed hub, when I was putting the tyre and tube back, fitting the wheel and adjusting the chain I spotted something, then muttered "oh s***.
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The chain knackered, its not gone where I joined it, I put a male/female half link in and thats where its joined. As it was fine when I did the weekly check on Friday so must have gone on my Tuesday ride to Wellesbourne. I kept the spare links when I shortened it when I was fitting it so I replaced the damaged links, thoroughly checked it and have ordered a replacement chain.