I have had the privilege of exploring a few BBC design derived speakers in my journey. They were all excellent speakers that I listened to extensively before moving on. These are listed not in any order of preference.
KEF LS50
ProAC 1 SC
The Harbeth P3
SpendorA5R (small towers)
Harbeth C7
Graham Audio LS5/8
The ProAC and the Harbeth P3 were my favourites specially with Jazz, Vocals. They did not live your my expectations with fast complex music. After a few months I discovered the music I was listening to was dictated by the speakers instead of being the other way around. Imagine that!
As my musical taste is a bit eclectic it’s not easy to find all rounders that scratch all my itches I guess.
The KEF LS50 are not the typical thin walled cabinet and their coaxial drivers may not qualify them to be in the list of BBC design based speakers. But they are decent all rounders master of none IMO.
There is only one way to discover- buy and listen to them for several months and decide if they are keepers for you or not.
Electronic pairing, room ancoustics and the other usual suspects apply of course.
@jenson, recalling your musical taste and the type of speakers you have had, I think I can safely say you will like them. Even the Chinese made LS3/5 clone (under license which I had for a couple of months with me thanks to
@KNRAMU sounded great.
My only suggestion is to carefully consider your room size and need for quality bass below 60-80 hz region (subwoofer integration needs patient tweaking)
Several friends on this forum have listened to some or all of the above listed speakers at my place and could offer their opinions and insights on them too.