Unfortunately you've hit on the problem. While US manuals are available quickly and easily, British and Commonwealth manuals aren't.
There are a few large collections of manuals around, and if you're looking for particular information then you can normally find someone to help.
With manuals like this being valuable, there's a very fine balancing act between releasing enough information to be helpful, and releasing copies more widely and thus devaluing the investment.
There's quite a good community though, and typically if you're working on a vehicle you'll find someone who'll run a copy off (or give up an original). They'll often run off a couple of extra copies so keep your ear to the ground.
Scanning takes quite a lot of time and effort though, and most collectors have got a backlog of scans on other manuals to run off for people.
I do know your pain though
It might help to explain why you want/need a copy.