Ah, I miss those LHR-ORY flights. Weren't they operated by TAT or someone?
If we're allowed to count B-Cal, my first was when we moved to the South-East temporarily, when I was 4, and flew GLA-LGW. My Dad did his usual trick of turning up at the airport early and then getting us on a much earlier flight. What he failed to do, however, was get our luggage on a much earlier flight, so we spent 2 hours waiting at LGW arrivals... The details I remember most was being bought a bag of Opal Fruits to keep me going.