L322 Webasto (FBH) glow plug change

Have any. of you ever done this? my FBH is in permanent fault and as the glow pin is being highlighted as an issue, I thought I'd start there. Just wondering how much effort it is to remove on the L322.

I have experience of these from our Freelander 1 days and did wire up a separate remote (non OEM) for it to enable a preheat function for my ever-chilly wife. I expect she will quietly demand that I do the same for her Disco 4 soon enough but for the moment I'll concentrate on getting mine running in preparation for the colder weather. I don't want to get all the way to the station and still have a cold engine/cabin.

Any tips gratefully received. I've read some of the threads on here but most are about diagnosing complex issues with them where I think (and hope) mine is more straightforward.
Below is the result of my HVAC fault codes and the reason I am leaning towards a glow plug as I'm sure it won't try to start without it for fear of pumping fuel with the dose pump into a chamber that will never ignite:

No idea how to get to the glow plug on your car, but glow plug problems are common on FBH's so you are heading in the right direction.

https://www.landyzone.co.uk/land-rover/fbh-all-you-need-to-know.207143/

hope this helps

Not too difficult to remove, remove battery as one of the bolt's is through the battery tray, N/S wheel arch liner off, clamp the water hoses so you don't lose too much coolant.

You may need to pull fuse 59 for a few seconds in the glovebox to clear the error on the FBH.

And it needs to be below 6° C to fire up but you can fool it by putting the temperature sensor behind the front grill in ice.

Lot's of videos on youtube for Webasto thermo top c repair.