Just happened across this whilst browsing some info on ownership of watercourses, thought it might be of interest since boundary issues seem to feature quite frequently.  Only a short read and some useful 'legal presumptions' in section 11.    HM Land Registry plans: boundaries (practice guide 40, supplement 3)     HM Land Registry plans: boundaries (practice guide 40, supplement 3) - GOV.UK WWW.GOV.UK