Hi Paul87,
I found this in another article, may it is of any help
To answer your question, you need to set up a Director’s Loan account for you.
Purchases you make from private funds will be paid from the relevant director’s loan account, which will then mean the company owes you money. When the company starts making profits you can take money back out of the business to repay the directors loan with no tax implications - as long as you leave enough money in the company to cover the corporation tax liabilities and other bills. (Just make sure you don’t end up with the directors loan in credit as it means you owe the company money, and there are some serious tax implications for this if you let it go on too long).