Just for clarity - in the UK, you can only edc (i.e. carry without a specific good reason) a sub 3in non locking folder.
But you can own all sorts, and if you were camping/backpacking a sheath knife would be perfectly respectable. You just have to use common sense - a Mora in your backpack while camping is fine - having it in your pocket when you go to the pub isn't.
You could certainly buy a decent sheath knife for camping and as back up if you find yourself in difficulties out in the woods. You could then check it in your luggage for the flight home, and take it home for the next trip you take.
Try Britishblades for more advice