Premature with your testing, the brickbug is in ICS, not GB. Your potential problems only start after ur upgrade.
I did the upgrade without even knowing the risks, my phones working fine, but I was personally pretty close to a factory reset after some incorrect adjustments to my build.prop file. Luckily I had finished all my setting up so I went for a reflash instead which fixed the file.
I see... My mistake then.....
I had a look on sammobile and saw the UK Rom was the LQ2 or something to that effect.... Isn't the UK version of ics on the suspect list of the brickbug...? Is there a list of the safe roms, stock ones and customs...? And also unsafe ones...?