Well well well, it's done!
I had today booked off work to get the rest of the outside prepped and painted, so after waking up at 12 I made a start. Popped out for a while to pick up some halogen work lights from machine mart, they helped no end when painting and pretty cheap too.
Pushed inside, jacked up and put on stands to make it easier to get at the sills. Then masked the inside off:
And then, as if by magic:
Couldnt resist peeling a bit of masking paper off! (Inside dirty from sanding the outside)