UK Property Law
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1. This point is governed by the Access to Neighbouring Land Act, 1992, and subsequent amending Acts. Here, the neighbour is entitled to access the landlord's land for "necessary works" once he gives notice to the landlord and receives the landlord's assent to those works being carried out. Should the landlord or you refuse, the matter would go before a judge and as a general rule, access be granted. If you refused permission here after the landlord had given permission, you would simply have an order for legal costs made against you in a court application, as access is always granted in this type of case. The law leans in favour of allowing the works to be carried out, once the person making the application acts in good faith. There is no limitation that works only apply to "emergency repairs" as you have suggested in your question. However, as a matter of courtesy, the landlords' agents should provide you with a list of the works to be carried out, if the landlord's agents do not provide it to you.
2. However, my advice to you is not to oppose the works now the landlord has given permission. You will simply be on the receiving end of a court application, with a liability to legal costs resulting. Once the landlord has given permission, the neighbour is entitled to carry out the works.