UPDATE - 27-05-2016
Update as promised
GOOD BITS
Reflashed the box last night and all went well. Rebooted OK. Reformatted the USB key (FAT32) and reinserted. Downloaded the XMLTV EPG and that process went smoothly. Rebooted. All OK.
NOT GOOD BITS
I have reached the conclusion (like many of you) that the XMLTV guide itself is the achilles heel in this process. Having now tried 6 different firmwares and multiple settings of BST and/or time offset on the box itself, nothing appears to make the TV listing times in the guide align with the correct time. The guide always shows times at +1 hour. I also see that many channels have no program listings at all (CH5, Sky Living etc).
It's such a shame that this box (which has performed faultlessly to date) is being let down by such a flaky EPG when there are other EPG's available (I have several on my Kodi install that work flawlessly)
Anyhoo, just thought I would offer some feedback rather than be seen as yet another 'hit & run' poster.
CJ