For legal reasons, The Mail on Sunday cannot disclose the identities of the people involved or any details of the relationship – even its duration – other than that they are middle-aged figures. The affair has now concluded.'
More here http://www.dailymail.co.uk/news/article-2334483/No-10-rocked-secret-love-affair-Stunned-PM-holds-crisis-talks-fears-tryst-blow-political-agenda-water.html
What is 'middle aged'? Who can we exclude from the list of possibles? Do we know it was a man & a woman? Two men? Two women? Who really cares?