The upgrade from WT+ to Club needs about 12,000 avios for each leg and as I currently have slightly in excess of 300,000 points, using some for this upgrade won't be a problem.
I realise that the "beds" aren't too wide but providing I get a window seat, I don't mind this at all.
I will be flying into the UK the night before the flight to MCO so will be pretty tired by the time I get on the aircraft and a couple of glasses of wine and a pair of good earplugs and I will sleep for much of the journey, something that I can never do in WT or WT+.
I'm a BA silver card holder so already have access to the lounges.
Many thanks for all of the advice so far.