The Lo-Co I work for was savaged by HMRC a year or so ago. They were aghast that we should want to apply RPI to our sector pay - so they stopped the tax free element.
We then had a nonsensical recepits debacle until we could prove that we were indeed entitled to claim a proportion of the sector pay tax free.
Given the difficulty of actually getting food/drink airside and the high cost caters charge, proving the case should not have been difficult - but HMRC managed to make the case as long and as tedious as possible.
Can't they find some non-doms to harass!