The lady I mentioned was near the center of tourism, on Oxford Street at Marble Arch.
McDonalds in Britain must have really gone downhill by the time I got there in 1991. I tried the McD's at Marble Arch, The Tower of London and in Norwich. Burger King on Tottenham Court Rd just off Oxford St. (near the British Museum) was even worse, terribly greasy. The only decent burgers I found in the whole country was at the Burger King on RAF Lakenheath. Thats a U.S. air base east of Cambridge.
I went to several different McD's and they all seemed the same to me. There is a Burger King south of Mitcham however that had the first drive thru window in the UK. Because it was the first, they used the US plans so you have pull up and then reach over and roll down the window on the passenger side to deal with them!