Don’t know the Ditton 66s but I helped rewire some 44s.
They were quite different to most modern speakers.
How to describe?
They had a more looser, faster, energetic bass for a start.
The giant bass driver must have played its part.
The sound was engaging and propulsive, brimming with life.
Downsides?
They were definitely more coloured than speakers of today.
I can’t describe this colouration, but it was there, a slight tint across the board.
If you like this colouration, then I’m afraid you’d have to spend an awful lot of money to improve on that energy.
If you don’t, then almost anything of today will be more neutral, if not more dynamic, full of life, energy and zest.
A lot depends on what you mean by large high quality floorstanding speakers manufacturered in the last decade or so.