Honestly mate save yourself a fortune especially with lost knives, buy a Frost Klipper, you can get them in Orange so you cant lose them and they have a great guarantee. Mine cost about a fiver. I have some nice knives but the most used one is a 4 inch folder by mamoth.
Go with a Frost Clipper. They are about Â£10 each and are excellent knives (it's what the Forestry Commission issues their stalkers)
Good solid knife, takes an excellent edge, and if you lose it, you aren't worried about the cost.
Attleborough Accessories has them in blue or daygo and I usually buy a couple at a time.
As already mentioned, the Frost range at Â£10-12 will see you right if you're worried about losing one, otherwise some of the others really 'look the part' without going down the expensive custom-made route
I would also recomend the mora clipper, but get the stainless steel one; it takes a little bit more effort to maintain an edge but you can put it and the sheath in the dishwasher to keep the hygene level (the carbon version is easier to sharpen but will rust in the wash.
For a quality knife you can't do better for the price
Nobody has mentioned 'Helle' yet - so I will. The Helle range have REALLY good blades in them, but of course, they do cost a few quid. My fav is the Helle Varg, which is small, neat, bl00dy nice and has a high-carbon steel core sandwiched between two layers of Sandvic-ish steel for extra longevity of the blade.
Failing that, wot Ugly said.
Frost knives are brilliant bits of kit for the dinero.
Wow!! sending knives to germany a bit like coal to Newcastle, no end of any good reasonably priced folders and rigids, any german hunting shop has a decent range , I am still using a Solinger Bub folder and solinger knecht rigid , which I bought at the jagdmesse in Buckeburg in the 70,s both still hold a good edge , it must be said though the only fieldwork I used to do was Falconry related