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If you are borrowing against the family home to purchase an overseas property you will need the consent of your spouse. Most financial institutions will let you borrow for most things against the family home except a start up business and where you are entering in to a leasehold contract.
They would obviously prefer that you borrow for home improvements. This increases the value of your home and their security. A lot will depend on how much equity you have in your home and how much equity will be left after you have borrowed.
Buying an overseas property should not be any problem. As usual you will have to provide, current p60, payslips, certificate of income to show that you can afford to repay the loan. If you can get a letter from an overseas letting agent to show that you will also have an income from the property also helps.