Scotland Bill

I have campaigned on this issue for some time, as has the aviation group within the House. We have asked for this tax to be looked at because it is just ridiculous, given what is happening in Europe. If the tax were to have been devolved, the Government's position was that it should be devolved and there was to be a variant—one would presume that that is why the hon. Gentleman is asking for the tax—where would the money come from for any downward variation?