The Queen had dindins (he was gaga by then) with Winston Churchill - and i think it was around the time he resigned and is indeed pictured outside No 10. I didnt realise it was such a big deal then
30 April 2002: Dinner at 10 Downing Street with prime ministers past and present and a visit to Wesminster marked the start of The Queen's Golden Jubilee celebrations. In an historic address to Parliament, The Queen rededicated herself to her role and looked forward to the forthcoming festivities marking "these fifty, unforgettable years".
In case you are wondering why this question PP, it stems from (what i think is a) faus pax by that dishy female cook (whose name escapes me) when she said to Carol Vorderman on the Breakfast with Frost (this sunday gone) that ....'you must be naive to think that there is only one entrance to 10 Downing Street'. She hinted that there are other routes and passageways into the place which is when we racked our collective brains over any pictures we might have seen of the queen on that famous doorstep.