Looking at the original patch repair, I would happily bet on that being my old frame, previously owned by clockworkgazz.
It had the original repair when I bought it, which had been done pretty well, but the long seatpost and a missing cobblestone eventually proved too much. I sold the cracked frame (for the same price I paid for the whole bike a few years earlier) at a bike jumble in Sheffield to a guy who went round looking for broken titanium frames which he then welded and sold ...
... he said nothing about welding seatposts to frames or I wouldn't have let him have it for free.
If anyone wants any further information about it, let me know.