Much easier than I was expecting with the fuel tank almost empty (low reserve).
On a T32 with standard 17” wheels and suspension I only needed to raise the rear wheels by 6” (breeze blocks), if you’re claustrophobic or a pie addict you might need to go higher.
Tie a thin rope to the cold exhaust and lead it clear of the van on the near side, it should be positioned midway (front to back) under the tank so that an assistant can take the weight of the tank with the rope.
Remove the screw and free up the filler neck to allow it to drop with the tank.
Slacken all 4 bolts by approx 3 turns on the 2 tank securing straps.
With the assistant taking the tanks load on the rope remove the 2 inner bolts on the 2 tank securing straps.
Allow the straps to drop and rotate clear of the tank, there is no need to remove the straps completely as this will make refitting much harder later.
The assistant can then gently lower the tank to the floor allowing access for removal of the seat brackets.
Re-installation is the reverse of removal. Don’t forget to remove the rope!