UK Property Law
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Thanks for your question.
Yes, you should write to the freehold owner/your landlord, The proprietorship register should list an address for service for them, write to them there.
Note that if you do extend the term of your lease you will require the consent of your mortgagee (if you have a mortgage), they may charge a fee (£200.00 all in) and will require you to enter a deed of substituted security so that their charge is registered against your lease post-extension.
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