Cheers Philip, the memory, all three sticks arrived today!
I'm the first to moan and I'll be the first to say well done for pulling out all the stops.
As you thought one of the memory sticks was goosed and the PC is now showing a healthy 6 GB of DDR3 and running much faster in triple channel mode.
Thanks for the battery as well, it was a doddle to fit in the 800D, with so much room I could even fit my ham fists in the drive bay and pop the battery in with no problem.
You're a credit to SCAN.
Thanks Philip, let me know where to post back the rest of the mem, I'll label the dead stick.
John