Except the BBC do undertake commercial activity within the UK through BBC Worldwide, by selling TV programmes and films through the BBC Store and on DVD/BD. So

Except the BBC do undertake commercial activity within the UK through BBC Worldwide, by selling TV programmes and films through the BBC Store and on DVD/BD. Some of the BBC websites that were previously blocked in the UK (such as Future and Earth) are now available because they don't show adverts to UK visitors. Surely the same can be done for the Travel website (show adverts to everyone except UK visitors).