I think the bit you missed out is there is nowhere else viable to build a new airport. By all means we can all go a bit Victor Meldrew now and again but there isn't a site available to the ideal, so that's why LHR is the only realistic and affordable option. It's the best of a bad lot.
Banging on about the mistakes of people who are likely now dead is fine, perhaps better fitted to JetBlast but it does not move the issue on one bit.
Unless David Cameron is suddenly ****ting gold bullion, the money (we don't actually have as we're still borrowing) is better spent on more pressing issues than buying and demolishing airports and compensating shareholders. Some reality please?