There are indeed 3 types of 1.2 Bravo's. Thank you Dan
Phase 1's are the older T reg models that have an annoying ECU. When you remap them, the ODB unit stops at around 80% and won't program any further. However, they still do tend to remap.
Also, don't forget the gearbox issue.
Phase 2's are between V and X plate, which also have dodgy gearboxes.
Phase 3's are from Y plate to 52 plate, and don't tend to have gearbox issues (or none that I've found), but apparently the girl who just completely knackered her Bravo had a 51-plate Phase 3.. but she was running 115BHP from a 1.2 - Not too clever.
All in all, there are not really that many differences between the three. Just make sure you get one with a quiet thrust bearing to ensure longetivety of the Gearbox and clutch.
Oh, and on the MPG issue, my Phase 3 Bravo could manage 48MPG whereas my Phase 1 Bravo would only manage 43MPG on the exact same journey on several different occasions.
My Phase 3 also had 30k miles more on it.
Could be down to a lot of factors I guess, but there's my two pence worth.