Thanks for your question.
Have you signed any form of agreement with the landlord?
Could you provide some more information on what is in the "work to schedule"? Did you volunteer it or did the landlord ask for it and who signed it?
I'm afraid private contact is prohibited between customers and experts.
The "provisional contract" you refer to; is this the actual lease or something else (an agreement for lease perhaps)?
If parties want to legally oblige prospective tenants to pre-lease works and a pre-lease schedule then they executed an "agreement for lease". This is not the lease itself, but rather a contract to enter in to a lease at a later date. You can sue under this contract obviously if the conditions are not met.
If the "Work to Schedule" is a document unilaterally complete by you, with no input from the landlord (or their agents) and neither party has signed it then it is difficult to see how one could claim it as an enforceable agreement for lease. They won't be able to to sue you under it for not completing the lease in the expected time.
There is of course the danger that they could find another tenant willing to occupy the premises immediately but I think you are in a better position to judge the probability of that, having direct knowledge of the premises/site.
I think you're just going to have to straight with them, attempt to postpone while emphasising your commitment to the lease and see what happens. You could attempt to negotiate a reduced rent for the period until you are able to occupy.
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