The Land Registry sometimes also take copies of the relevant conveyances if they have specific relevant information - you can usually purchase these as well.
Bear in mind that what the LR write isn't necessarily what is in the original conveyances, which can get adapted or differently...
Only just in from work. Public rights of way officer - so this sort of thing comes up all the time, even though in your case it is a private rather than public right. The Deeds are all-important, as that is what the legal bods will pore over and argue about if it ever comes to it. So always...