Here's the only pertinent information I found in the Bentley;
7. While supporting the tank from below. remove the fuel
tank heat shield and support strap mounting bolts. See
Fig. 1. Carefully lower the tank from the car.
Installation is the reverse of removal.
Tightening Torques
• Fuel level sender/fuel pump to fuel tank
M6 nut 10 Nm (89 in-lb)
M8 bolt 23 Nm (17 fHb)
• Fuel tank to body 23 Nm (17 fHb)
• Heat shield to fuel tank (bolts) 10 Nm (89 in-Ib)
• Fuel tank drain plug
(with new seal ring) 25 Nm (18 tt-lb)
• Hose clamps
10 mm to 16 mm diameter 2.0 Nm (18 ln-lb)
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There's more if you end up needing todrop the whole tank but looks like the heat shield and straps should not require that much and there doesn't appear to be anything further involved..