British Royal Mint Selling & Sorting Gold for Pensions

The British Royal Mint is looking to sell more of its gold reserves in the form of gold bars for pension funds for the first time. They are charging 1% to store it and then they want VAT tax on top of it all. They are selling 100 g or 1 kg bars. The problem, of course, is government historically can just arbitrarily change the law and there is nothing you can do about it. They are advising people to place up to 5% of their pension in gold, but this should be tax exempt.