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@Zippie
Definately a crack in the frame, exactly the same happened to my Tempo, and I had exactly the same thoughts too. Reason - burr left on the inside of the down tube weld, seat pin presses, metal cracks. Condor had a number of exact replications from the same period, problem now rectified, if you frame is still within warranty they will replace it.
The crack is in a place where a drastic failure is unlikely - it will just slowly spread - I rode mine for about 6 months knowingly until a replacement frame became available - and I am nearly 14 stone and like to sprint - no problem just slowly spread - but keep an eye on it because it will fail eventually.