Scooby my gorgeous ginger male went missing for just over 2 weeks last month, We came back early of our holiday because we were so upset, DONT GIVE UP, we did all the same things you have done, including the council, hedge cutting farmers, Then one night he just strolled in as though nothing had happened, Typical Male, There are some great web sights with found cats in your area, its worth looking.
www.nationalpetregister.org/
www.ukpetsearch.freeuk.com/
www.foundandlostpets.co.uk/
Its just the not knowing, Best of luck