So, I finally did my doors,
guide was excellent.
Interestingly I found that one of the rear doors had previously been done, but in a very half arsed way (very little sealant and only one door)
I also got a small waterfall emerge from one of the back doors where water had obviously been collecting in the door card!
Two things to add which helped me a bit.
#1 - I'd advise getting some white spirit, it's useful for cleaning up around the old seals for both taking the old one off and evaporating residual water left in the seal if you're not lucky enough to have a garage to do it in, or somewhere dry to leave your car for a couple of days out of the rain.
Also useful if you smear sealant anywhere you didn't mean to!
#2 - When taking the door cards off, there is a bit of force required to pop the door clips off, working from the bottom is a good plan and the tendency is to lift out and upwards. Make sure on the front doors you lift OUT rather than UP. I lifted more up that I needed to and when the the clip unpopped I broke the plastic triangle which sits of the front bottom corner of the window
I think I may need to get a new one, but for the time being I superglued it on and it seems to have held for the time being, touch wood!