Interesting about the King Air Tom24 since I was puzzled to see the same type flying just north and I mean just north of the M4 at about 1500ft one day last week. As I was at Heston Services right next to LHR when I saw it I was puzzled as i ddint think any non LHR aircraft were permitted that close to Heathrow. Anyway it proceded serenely westwards and disappeared into the clouds.
Are such flights allowed so close to Heathrow thiswas probably slightly less than a mile north and parallel to 27R
PB