Answers:
For internal doors you can use what you like (gloos -satinwood- eggshell) depends how you want to be the finish, yes i will paint the skirting with same paint
Beech and hornbeam hedges can be pruned in august. they grow rapidly in the early part of the year, but need to grow a little after cutting to make sure there are no bare patches through the winter. if the hedges have grown too large, cut back hard in mid-winter, avoiding very cold spells.
Almost all the the hairline cracks are at first floor level, the worst ones ... time of year when people put their heating on and the weather is damp.
The water base paint is not going be yellow quick like a oil base paint