I would ask you to use the guidance in HMRC’s Business Income Manual at BIM47815 and BIM47820 on how to apportion property costs and the types of expenditure that may be claimed. You can use the weblinks below to view this guidance.
BIM47815 - Specific deductions: use of home: apportioning the expenditure
BIM47820 - Specific deductions: use of home: specific expenses
There may be capital gains to pay on the sale of the property where part of it is used wholly for business purposes, please refer to the guidance in MRC’s Capital Gains Tax Manual at CG64663, weblink below.
CG64663 - Private residence relief: non residential use: part of house used exclusively for business
Please note that any deductions claimed by the company for use of your home will have to declared in your personal income tax returns.
I cannot advise you on any arrangements that would avoid personal income tax liabilities.