Adam Smith institute tend to be fairly reliable, too... It's later under Thatcher than I would have thought!

Well, obviously I can't give a firm date, but if we're cutting the overall tax burden it would be earlier, yes? But I know £20 billion isn't a huge amount in terms of overall government take, so we'd lose a couple of days, maybe?

BTW, I really want to introduce you to Charlotte Gore. She's a "reluctant" Lib Dem member, works in finance, and she makes you look like a raging leftie.