Set off to tackle the fuel filter today. If you remove all these bits
(Wipers, scuttle, end pieces, air intake duct, insulation)
Then you get a pretty good run at the top of the engine to change the air filter, and remove the fuel filter
However, in order to actually change the filter you need to undo these 3 T15 Torx screws on the top of the filter:
However, whoever did this last time, tightened them up like a gorilla, and they are not for shifting. My first effort just snapped the end of my Torx bit. Then I tried a bit more carefully, giving them a good tapping with the torque on, but couldn't move them, and the torx bit was just twisting the end off! A new lid is just over £100 from Pug - you can buy the bolts separately - but they are £7.85 EACH

I did think about drilling them out, but I didn't have any suitable replacements. So, put it back together, and then maanged to snag a complete unit off Ebay for £43 - which is not that much more than I paid for just the filter bowl part. So put it back together for now, will need to get all the top off again another day....

Stuck a new battery on as well while I was there - managed to get a Yuasa 5000 off Amazon for £88, so that's pretty good. That was pretty straightforward, once I had figured out how to spring the clip to get the charge unit off the top of the battery cover. Hopefully it will be less reluctant to start on cold mornings now.