Aha - we are making progress!
Yes, #10 is a Guy Victory U.F. but don't know about Guy Motors being in Belgium? They were British.. you're probably right about the body but can't find any confirmation of this (there's another point in it for you if you can show me any proof of it being built by Jonckheere?)
If you Google "Guy Motor Coach, Belgium", you'll find the info. There is a photograph of another belgian Guy Victory bodied by Jonckheere, hence my guess. But you are probably right : these buses were made in Britain and bodied in Belgium. Some of them are very intriguing.
#23 Toyota DR15 from 1961 ?
#23 is a Toyota, yes, but not a DR15; it's much earlier than 1961.
The Guy Victory was a lovely coach introduced in 1958, and was made available as a chassis for bodying in the UK, Europe and "Commonwealth countries"! It had an advanced specification for its time, competitive with European coaches, in contrast with most of the agricultural stuff the British manufacturers insisted on keeping on making. It didn't help them in the end of course, as the went the way of most of the British motor industry...
There are pictures of various European-bodied ones, some of which were doubtless bodied by Jonckheere, and very attractive coaches they are too. But there is no mention at all of who bodied them, so it's pure guesswork!
Below are a few more details of the Victory from their contemporary literature:
