Tonight I replaced:

Fuel pump
Fuel pump seal
Fuel filter
Fuel filter non return valve

And I learned:

1. Mario of Roverlord is a champ.
2. Don't have your pump fail with a full tank. Probably should have siphoned some into a jerry can.
3. A BiC with the ink and end cap removed gaffer taped to a length of hose makes a great vacuum cleaner attachment for removing red dust from around the fuel pump.
4a. You don't need the special tool to remove the pump retainer collar. Persuader and an old screwdriver do the trick.
4b. Pump seal is not your friend.
5. The brown paper cushioning material inside the VDO box is very diesel absorbent.
6. Hand tight and hand loose on my fuel filter seem to be very different things. Have a spare filter wrench.
7. Head torches are not just great for camping! (But I already knew that)
8. The click of the torque wrench at exactly 140 nm on the wheel nuts is a very satisfying sound.

Gary purring like a (very masculine) kitten once more. Thanks all!