Hi Luksus, Moem, sorry for the delayed reply, I have been offline for a few days. Thanks to both of you, its sounds like the most likely scenario. I didn't have a chance to post before I went AWOL. But I did try a unlock and reinstall, which appeared to go perfectly. But on boot neither sim slots were recognised and I received a 'No Network' in any app that would address the sim.
To test I reinstalled the latest FP3 android and all worked correctly. I will try putting UT back on tomorrow and see what happens.
Thanks guys for all your help so far.
I will let you know if I stuff up my phone again