I presume you live somewhere under the ILS for Heathrow?
Hearing the aircraft calling tower/director (accidently) while listening to LBC was how I first got interested in aircraft when I was a boy living in Fulham. I then went on to work for LBC which is a bit weird
It can happen even with expensive digital PLL radios as well as cheapo transistor ones.
Certainly helped with my RT for the PPL
DenhamPPL