UK Property Law
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If you have exhausted all reasonable efforts to gain a release from the covenants from the estate then you should consider obtaining a restrictive covenant indemnity insurance to cover the liability of the future breach (ie. your works). For example, were you to sell the property the purchaser's solicitors would ask for such a policy (in the event that consent was not obtained).
If you google "restrictive covenant indemnity insurance providers" you will be able to make inquiries with insurers. They will need a copy of the wording of the covenant, the nature of the contemplated breach, the date the covenant was imposed and details of the steps you have taken to contact the person with the benefit of the estate.
They are relatively cheap (approx £150 depending on the value of your property) and the benefit can be passed on to your successors in title. You will also need to contact your lender to gain their approval of the policy.
You also have the option of apply to the Lands Tribunal to either modify or be released from the covenant, though this is quite an expensive and slow process.
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