The first Pan Am 747 arrived at Heathrow in mid 1970. I was on duty at the old LATCC radar unit on the north side (where Compass House is now) on the day it arrived (afternoon shift for D watch). This may ,of course, have been a proving flight rather than carrying fare paying passengers; certainly it did a jolly out to Brecon and back later in the day. The pilot's first words to London Control after departure were 'I'm not going to make 4000 (ft) by Woodley'!