A Qatar C-130J just went over London very audibly (24,000ft) out of Cambridge by the looks of it.
And, speaking of helicopters, the mis-reported "Philippine Cessna 182" (here on PlaneFinder) was actually the ubiquitous Agusta A109S N449C, which made a brief visit to Elstree this morning, arriving from and departing to the northwest.
So DRUK, how the hector does an A109 with a US reg show up as a Philippine registered fixed-wing aircraft ? Hex error, or a red-herring to put of the amateurs ?