Re the Sedburgh (T21b) picture.
The colour scheme is 1970 ish UK 'Air Cadets' without having those words painted under the cockpit and they're certainly UK style roundels, but you wouldn't wear those hats whilst flying in that open cockpit; well not for long anyway!
But it's not UK. Air Cadet Sedburghs used in the UK were retrofitted with a horrible canopy (well all ours at Halton were anyway) and there's no sign of that on this example, plus the right spoiler isn't 'fully closed and flush'.....
As for runway numbers, they are visible in that photo.