@Rich123
I had a bit time to think about.
I learned, that a knife can easily be confiscated in Britain. It should be very cheap.
You wrote, that you want to go out in high summer and that you are nearly 70 years old.
I guess you will not become stronger from year to year. A strong knife is a brick in the hiking ruck sack.
See, if you can save 10 x 100g in your equipment, that's 1kg. And a kilogram more or less on your shoulders will make a difference for you!
Full tang knifes and strong folding knifes usually weight round about 150g or more.
It is better to carry a very sharp and very light knife, than a very strong one in my opinion, especially in the summer.
In the other thread I offered you to help you with a very light hiking equipment, if you like.
And here I recommend you a very very light but very very sharp and very very cheap knife:
In my opinion you should buy an Opinel No8 Carbone!
It weights only 45g! Handle length 11cm, blade 8,5cm long. That is incredibly light and really long enough!
I am easily able to get it razor sharp with a simple and cheap small Laguiole sharpening stone.
I am totally convinced, that this would serve you very well on your short summer hikes!
You don't need the tin opener,cork screw and scissors of the Victorinox Compact which I usually do recommend. You can cut your nails before starting the hike and tins and wine bottles you surely will not carry around any more. The Victorinox Compact is a long journey knife. I guess you plan to do short hikes, isn't it?
For this, the Opinel Carbone No8 is very nice.
And this is obviously no weapon. It is a well known French farmers knife, and a policeman who would confiscate it from a grandpa's ruck sack or trousers pocket obviously would be insane.
See, the Opinel Carbone No 8 is nearly as long as my full tang knife, which I use for winter camping! In the summer the Opinel No8 is really long and strong enough!
It costs only round about 12 €.