Okay, if you did not do this or receive a warning notice 14 days before you executed the lease then the Lease is not excluded from the Act.
This means that you will have to serve a notice under s27(2) Landlord and Tenant Act 1954. You must have been in occupation for at least one month and give the landlord three months notice with such notice to expire on a quarter day (25 March, 24 June, 29 September or 25 December.
It is very important that the notice is in the correct form and you should get a solicitor to draft and serve it appropriately. If it is not in the correct form then it may be defective and you would find yourself liable for continuing rents until a correct notices has been served and has expired. It will not be that expensive, £250.00 approx.
He will also be able to tell from looking at your copy of the lease whether it is excluded from the Act.
You can find solicitors in your area by using:-
Enter your postcode and select "commercial property". I would not wait because you will have to serve the notice before 29 September.
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Edited by Thomas on 8/26/2010 at 4:16 PM EST