It might be worth contacting your local tools for self reliance group, not sure if there are any in lancashire but my dad started the groups in birmingham and malvern hills, they get donations of old tools, do them up and either sell them for money or post them (preferred, but you can imagine that its not very helpful to send thousands of imperial spanners) to certain projects in various African countries, I think about 5 or 6.
I can't remember if they had many billhooks in birmingham but now in worcester/herefordshire area they seem to have have soooo many, he always seems to have 5 or 6 that he is doing up to sell on, a variety of patterns and such like.
Maybe you have a local group that have some refurbs on offer.