Only gone a far as using the pencil, and filing in a square without committing myself to submit. If the softway already highlights the FP and BR I am curious what the value of the end product will be.
My first choice is a lostway I know a bit of history, one square is already greyed out and some of the other ways are internal drives and lanes within an estate, which constitute the total way, but without an explanation of the original which was a right of way 1900-1930's as it provided a way for the staff of an neighbouring estate to cross the adjoining estate.
My second choice was a square with a very important way in it, key to a 20 mile cross county route that ticks all the boxes the Macmillan Ways are trying to achieve without getting tangled up in existing LDP's. This square is is crammed full of other FPs that are the shortcuts of yesteryear and old ways to work, which are 'the meat and drink' of the CLA's argument against Lostways. So I will wait and see if some Rambler pounces on it thinking they have discovered a jackpot, don't mind if someone else spots the real way, there is another but that is not visible on the old maps. It is another sort of lostway altogether.
P.S. the website suggests that it is good to look for ways that suddenly end, County and Parish boundaries is the best place to find these, they are the classic anomaly. However ex War Office or Min. of Defence land is also an ideal starting place. This is because the sort of green welly, Cirencester graduate the Home Office select for the Estate Agents are usually wannabee landowners, who like to swan around the County Set pretending to be important people, probably one single group of people, who have done more damage to the Definitive Map than any other apart from the defunct aristocracy.