Hi S R - The red edging on the title plan does not indicate boundary fence responsibility.
We do not specifically record who owns the fence as that is not something that forms part of what HM Land Registry record.
In many cases the title register for a property might give information about who owns or is responsible for boundary features such as fences, walls or hedges. Generally this information will only be included if it was mentioned in the title deeds sent to us when the property was first registered; or if the property was originally part of a larger piece of land or property and provision was made in the transfer from the seller to the first owner, for its ownership or responsibility.
Often we may set out the relevant information in the title register. At other times we may retain the old deed itself and the title register may refer to these deeds as 'Copy filed'. However, it is not unusual that neither the title register nor any deeds will contain any information about boundary ownership or responsibility.
Please also refer to our blog – Drawing the line on boundaries
In deeds that do contain information, the most common marking on deed plans indicating who owns and is responsible for the maintenance and repair of a boundary feature, is a 'T' mark. Such a mark normally means that the owner of the property into which the 'T' extends owns the boundary feature and is responsible for its maintenance. But you must read the wording in the deed to make sure this is the case.
We do not generally reproduce 'T' marks on a title plan. If a 'T' mark is referred to in a deed we usually add a note at the end of the register entry which mentions the deed, such as: "The 'T' mark referred to affects the northern boundary of the land in this title."
I hope this helps.