Ok, so what have we learned today.
I decided to be a guinea pig and attempted to reload 3 rom onto 2.1
As Moko76 suggested, the 3 rom reverted the f/w to 1.5. No big issue but might be worth noting for others.
So, phone is back on 1.5 and still have the H vs 3G issue around the property. Figure sod it, worst comes to the worst i am back on 1.5 so rang 3's tech support
Yes Slug, 3 are currently doing upgrade work to the network is sunny Manchester lol. Sods Law that the outage occurs exact same time i do the factory reset
So, what to do now? Go back to 2.1, leave at 1.5, have summat to eat, have a nap lol?!
It's been fun going back and forth lol, i think i'll have a rest, leave the phone be for a while and then go back to 2.1 later today and see how the handset performs at work.
Thanks for the advice and like i say, seems if you go from 2.1 to 3's rom your f/w will go back too