I usually fly business class

[cavortingcheetah]

Then government employees should have an option. Either they travel on an economy ticket or the government will book them a business class ticket. In the latter event, the difference in cost between the two classes of travel will be taxable to the employee as a benefit in kind.
Fair is fair after all; a hackneyed word much used by everyone and thus so easily turned against anyone.

edit: spelling correction.