JDK wrote:
One year had the Bristol Blenheim (ARC) two Lysanders (SOT / ARC?) and the Gloster Gladiator (Shuttleworth) flying together - all of the worlds running Bristol Mercury engines...
I've got shots somewhere of the same formation, but with THREE Lysanders (SOT / ARC / Shuttleworth). Six Mercuries in formation. A sad thought that only the two Shuttleworth machines are still airworthy (Gladiator and Lysander) out of those 5 aircraft.

Legends in the past has had 4 Skyraiders together, plus 4 Hurricanes (with a fifth from the BBMF flying later in the display IIRC) over the years.
And how about three BrisFits together at Legends and Old Warden in 2006 - almost certainly never to be seen again.
Looks like the old memory is at fault then! Well remembered Mike - odd since I published a piuc of the event! And PeterA is also right with the 20+ Spitfires - and, IIRC (prob not) that was the four Hurricanes.