www.ultimatehandyman.co.uk

Seems to be a mixture on new builds here of taped joints on feather edged p/boards or full skim. Having said that, there's a fair amount of paramount partitioning too (bloody hate the stuff) I have plaster boarded some studwork, in the past, but only really to help myself (can't abide waiting on other trades) If I'm fitting a kitchen, I prefer to do my own wet plumbing for this reason.
I've only come across close boarded roofs a few times, (must admit I've only ever done one pitched roof that's been close boarded and that was on an extension coming off a flat garage roof) (weird to explain)

Nearly every new build in Scotland is taped I'm sure. Never seen it on new builds other than communal stairs. Most of the big developers don't bother with sheeting the roof other than council housing.