Small payroll income so that you fall within a low income tax bracket. Top up salary with dividends as they have a much lower rate of tax. If you have a live at home wife, make sure she's employed by the company in some form, eg. you can pay her the minimum wage for secretarial duties. Ideally falling within the tax-free lower bracket. Unlike regular employment, you can start claiming a lot of everyday things such as food/transport/home office electricity/internet/etc. as business expenses, thus meaning you can claim 20% VAT (sales taxes) back depending.
Ultimately, there's also the final payout if you manage to sell the company. If it were classed as regular bonus income, you'd be taxed at 45%. Instead you get charged as capital gains at 18-28%. You can also get entrepeneur relief on the first £10m which means you only get charged 10% instead of 28%.
NOTE: Some of these are loopholes like dividends and employing family. They tend to get cracked down on every now and again (I'm not even sure if they're valid now)
But when you get down to it, there are a heck of a lot of potential savings over standard income tax (currently 40% on anything over £32k, 45% over £150k)