Tax efficient way to withdraw cash from company

Hi

Looking for some advice as to the most tax efficient way to withdraw cash from a limited company.

The company has built up cash reserves of close to £1m over the last 20 years trading and we would like to pull some cash out (300-400k)  in the most effient way. What are the options available to us ? The business is still trading and will likely continue trading for anoher year or two.

Thanks in advance

Chris