Ok guys, thanks but you are still going a bit too fast ;-)

If I recall correctly, I need 2 files for upgrading. Will that be the K800_R8BF003_MAIN_GENERIC_WI_RED52 and K800_R8BF003_FS_CENT_EUROPE_RED52 - I live in the UK

The flashing guide link you provided also mentioned about upgrading from CID49 to 52. I presume I need to do this to allow the files to update the phone.

The guide then says you have to Costomize your phone. How do I decide what CDA to use? There are loads to choose from.

I know these are probably stupid questions but please bear with me and many thanks