I have the model 30 cooker, and am perfectly happy with it except for the high maintenance and high cost of spares.
Defender has two kits currently, one being a closeout with only one in stock. My problem is the burner outer cap which I keep burning out every year or so. They're brass which does not stand up well to the heat. The "extended" cruising kit has only two outer caps for a 3 burner cooker. and you get copper tubing which you never need and can get about anywhere if you do need it.
The Blakes & Taylor website is just about usless when searching for spares, but they are helpful and usually speedy when inquiring about parts, although, I did have to send them a photo of a part I needed cause it's not listed in their spares kit. They can direct you to an appropriate dealer in the UK (I think it's an in-house dealer).
I keep thinking I want to chuck this
stove over the side every time it breaks down, then I jury
rig a part and it's OK for a while. And at about $2,000 US, it's not cheap.