The Tripartite Legal Test: Nec Vi, Nec Clam, Nec Precario
To establish a legal prescriptive easement under UK property law, the claimant must prove that their historic use met three strict common law criteria throughout the entire 20-year period:
1. Without Force (Nec Vi): Use must not involve breaking down fences, cutting padlocks, or overcoming physical barriers erected by the servient landowner.
2. Without Secrecy (Nec Clam): Use must be open and visible to an attentive owner. Sneaking across land under cover of darkness does not qualify.
3. Without Permission (Nec Precario): Use must be asserted as of right. If the servient owner granted written permission, a formal licence, or an informal verbal agreement, the claim of prescription fails completely.
How to Prove a 20-Year Claim with Form ST4
Claimants do not need to have owned the property for the full 20 years personally; they can tack on the qualifying usage periods of prior owners to reach the 20-year threshold.
To formalize the right on title deeds, the claimant's conveyancer submits an application to HM Land Registry under Practice Guide 52 using Form ADV1 accompanied by a statutory Statement of Truth (Form ST4).
The Form ST4 must detail: (a) The exact route used marked on an Ordnance Survey plan, (b) The precise nature of the use (vehicular, pedestrian, agricultural), (c) The frequency of use, and (d) Sworn statements from current and predecessor owners.
Can a Prescriptive Easement Be Challenged or Overturned?
Yes. The servient landowner can defeat a 20-year prescription claim by proving: (1) An interruption of use for more than one continuous year, (2) That express permission was granted, or (3) That unity of seisin occurred (both parcels came under common ownership, extinguishing separate easement claims).
If the servient owner formally objects to the Land Registry application, the matter is referred to the First-tier Tribunal (Property Chamber) for legal adjudication.