Update for those still interested - Pictures have just been taken I'm afraid as I was so busy today that I forgot to take any
Today I have removed rear bumper:
Cleaned up all the underneath, I still think there is about another 1-2 hours worth of cleaning to get it to the stage where its ready to weld and then paint. This took a LOT of work:

Just infront of the wheel well

Boot floorpan

Chassis rail

Very rear of the boot floor

Beginning of the wheel well

End of the transmission tunnel

Spring cup where it's been previously welded
It's not being welded until next wednesday, but in the mean time I can:
Keep cleaning underneath
Paint shocks yellow again
Paint tank black
Paint hubs (unsure to do black or silver)
I am very pleased with my progress today as it may not seem it, but to get the underneath looking like that took a LOT of work and I am happy