As a director of a limited company, you can set up a scheme whereby your company pays a pension contribution which is completely seperated from your salary. This would be the most tax efficient method.
Whether or not you should pay into a pension or save requires a lot more consideration. Very broadly, if your anticipated income in retirement is likely to be sufficient to put you in the 41% tax bracket, then there's less incentive to put money into a pension, all things considered. But if your anticipated income in retirement is likely to be taxed at 20% or less, but you're currently paying tax at 41%, there's more of an incentive.