Think like a politician.
It's not just the tax. It's the sense of fair play, of right and wrong. At the moment there's no level playing field: if you're big enough to set up a distribution centre in Jersey then you get a 20% tax break that isn't available to smaller retailers based on the mainland. This discourages small business and free enterprise, and strikes against the concept of equal opportunity for all.
OK, larger companies get advantages from economies of scale that smaller companies don't have, that's just life, but using taxpayer's cash to subsidise a few big retailers to the tune of an extra 20%? If you were George Osborne I'm sure you'd agree there are much better things on which you could spend this money.
Imagine for a moment that you're The Right Honourable $YOUR_NAME, MP, holder of the office of Lord High Treasurer, one of the Four Great Offices of State: you are Second Lord of the Treasury, the Chancellor of the Exchequer of the United Kingdom of Great Britain and Northern Ireland.
This a serious job. You sit as a personal advisor to the Queen on Her Majesty's Most Honourable Privy Council. The nation trusts you with its finances. You have sworn a solemn oath to act as a faithful and true servant. You must consider your actions carefully, and let wisdom and justice be your guides.
If you keep the MD of Play happy, your kids get a free Xbox. On the other hand, if you close this VAT loophole and spend the £130M/year with one of the big consultancy firms, you get a month in Tuscany over the summer, two weeks in the Carribean for Christmas, and when you're voted out at the next election there'll be a nice non-exec director's job waiting for you.
If you can think of a good way to frame what you're up to as some sort of principled stand against a contravention of Natural Justice (ref. my first two paragraphs) then you've got another "what a top bloke I am" chapter for your autobiography; once you've collected a few of these and a few "what bastards the other lot are" chapters you can publish for an extra bob or two.
Easy. Now let's get on with the MoD thing. Might be worth checking if any of your old University chums know anyone who runs a lightbulb-manufacturing company.