As it looks like a Blackburn Swift/Velos/Dart,could be at Brough....?

Not Brough either.

That type of hangar was used at Upavon.

But it's not Upavon either.

Perhaps Gosport?

It isn't Gosport either 56.

Three Lightning squadron numbers and one Jaguar squadron number operated here in the thirties.

The Lightnings squadrons were 111, 19, and 23.

An Empire Day airfield.

It isn't Kenley is it?

No - two letters back in the alphabet......

……..
https://cimg5.ibsrv.net/gimg/pprune....39dab8e0bb.jpg

Hendon? tho I'm baffled by your last clue...............

My last clue simply lists the Empire Day airfields of which the challenge is one, but it's not Hendon.

There is one there which is the answer.

Or,back 3..any Hs

Surely by now someone must shoot correctly...…….

Hornchurch....OH if correct,as/when...

The challenge has been up for well over 24 hours so I may answer.

It is indeed Hornchurch, sycamore. I'm glad you got there.

sycamore has declared OH.

Ah, Hornchurch!! No aircraft when I went there, but lots of oil drums, planks, and lengths of rope. OASC in its pre- Biggin days.

Blimey.

You're older than me !!

So am I - I did my selection board at Hornchurch