Ask an Property Solicitor. Get an Answer ASAP.
I have been asked to look at this for you.
If you can let me have sight of the repairing covenant page in the lease, I can probably expand my answer based upon what you have said, if you are responsible for repairs and upkeep, then this comes down to you.
Sorry, I know it’s not the answer you wanted. What you might want to do of course is have your own inspection done because it may be that although some work may be required, the landlord is simply trying to get the whole place rewired at your expense.
.Can I clarify anything else for you? I’m happy to answer any specific points arising from this.