The Daily Mail produced this bit of impartial journalism. They quote "a fellow diner" but do not say who said person is.I understand about the importance of confidential sources but they present this person as a passer-by (so to speak), why wouldn't they want to go on the record when all they've done is report what was said and eaten? I wonder if there is a word of truth in any of this.
And if there is, WHO CARES! If Crow is wants to drop 650 sterling (about $1,000, I believe) on lunch, that's his business.
http://www.dailymail.co.uk/news/article-2003716/Union-boss-Bob-Crow-takes-break-Tube-strike-plan-650-lunch-Mayfair.html?ito=feeds-newsxml