Thought I better check in and let everyone know I'm alive and well and.....it's out!
All cables and brackets disconnected, rods fitted and other supporting bolts removed and ready to start lowering:
Some of the big M12 bolts spun out by hand once loosened however a few of them were very tight all the way out, and one of them I was only just able to get undone with large 1/2" drive torque wrench with both hands on the end of the wrench and my foot pushing for counterbalance on the extension.
The threaded holes are all fine and the threaded rods screwed in by hand so the tightness just seems to be a slight bit of rust on the bolt threads so I'll clean those up before refitting.
I was a bit late getting started and had to run to B&Q to get more suitable washers for the spacer tubes so I ended up not finishing until 2 hours after dark.

I was determined to get the pack out into the garage so I could work on it during the week.
It's VERY heavy! I was just comfortably able to pull it up the slight incline to my garage by myself with a bit of a run up using two of the ropes. Good job I'm a 100Kg fatty at the moment, if I was a bit more lightweight like I once was I don't think I would have had the neccessary anchoring weight to move it...

The trolley seems to handle the weight without any problems and considering the 240Kg weight the caster wheels were easy to roll.
The underneath of the car looks hollow and empty without the battery pack, there's hardly anything to it! I couldn't get any pictures as it was dark by then but I'll take some before refitting.
So that's phase one complete. The plan now is to remove the top cover and disassemble the three cell modules that have the faulty cells to swap after work during the week and have it ready to go back into the car next weekend. Of course of the dozens of screws that bolt the top cover on every single one is badly rusted so I've given them a good spray of rust penetrant and some time to work before I attempt to remove them...