I am no British advocate.
In my opinion the only option to carry legally a locking folding knife in the UK is to carry a shortened and deasembled Opinel No7 Carbone.
It is possible to give it a lower tip if shortening the blade.
It works well as a friction folder when the blade became a bit rusty where it touches the handle.
I mean to carry a shortened Opinel Carbone No7 in the right pocket. The locking ring in the left pocket with the plyers.
In Germany the opinion is that a fix blade knife up to 12 cm blade length is a tool, and OK to carry it well visible at the belt especially if there is a good reason to do so. But a hidden carried one hand locking folder is seen as a weapon that easily could be used in an attack.
An Opinel is obviously a farmers knife.
And an outstanding good food preparation and carving knife too.
I think this Opinel or a typical small Swiss Army knife like the Victorinox Compact or Climber as EDC or a real full tang survival knife in the forest for bushcraft, survival training, hiking and camping are reasonable choices.
I could carry other locking knifes in Germany. But because I don't trust the modern locking mechanisms I don't buy such stuff.