That fact was set out explicitly in the transfer.
Amongst these easements were such Legal Interests as having your water, sewage, gas, electricity or phone lines passing under or over the retained land, but also the right of way to pass and repass aross the council's retained land using the route that existed when the sale of the property was completed.the right to pass and repass at all times and for all purposes over and along any existing passageways upon neighbouring property that have hitherto been used by the buyer and laid out for the purpose of gaining access and egress to and from the property on foot only (in respect of routes designed to be used on foot) and with vehicles if designed for vehicles in common with the others entitled to share use of the same
if access and egress to the property cannot be obtained directly on to a public highway the right to pass and repass over any intervening land retained by the council to gain access and egress to the public highway by the same route and in the same manner as the buyer has used hitherto in particular but not Ltd to the route
all statutory easements over neibouring property that benefit the property
where the use of any means of access is shared between several persons those persons shall not unreasonably obstruct or hinder the full and free use of others entitled to use the same
the property is sold subject to all existing encumberences
Your Legal Interest is not a matter for mediation. It is an absolute legal right that is part of your property.
The Housing Association and your neighbour are causing a substantial obstruction by placing a padlock on the gate and if Gateway have provided their tenant with the means to obstruct your Legal Interest over their land, then an Injunction should be applied for as soon as possible.
That is the initial process, but a full trial will then be necessary to decide matters of law.
The facts are clearly on your side, but you will need to understand how much money it may cost you to take the matter before the court unless Gateway back down prior to any formal court hearing being needed.
Your claim will be to have your right of way fully reinstated and left unobstructed, together with a claim for damages, because there has been a legal nuisance committed against your Legal Interest in land, which is an absolute property right.
See Law of Property Act 1925 Section 1
1. Legal estates and equitable interests.
(1)The only estates in land which are capable of subsisting or of being conveyed or created at law are—
(a)An estate in fee simple absolute in possession;
(b)A term of years absolute.
(2)The only interests or charges in or over land which are capable of subsisting or of being conveyed or created at law are—
(a)An easement, right, or privilege in or over land for an interest equivalent to an estate in fee simple absolute in possession or a term of years absolute;