Your local Air Cadets/VR(T) or whatever they're called now would be grateful for the "blue" stuff. They only get one initial issue of No 1s, and No 5s are not provided!
The tropical stuff may be trickier - although the 6A is quite rare. I was getting rid of some uniforms for a deceased mate - or rather his widow - and the RAF Museum (Cosford) graetfully took it on!
Just had a thought: if your "Somewhere Sunny" should be Cyprus or Gib, then they have got Air Cadet units so my para 1 may apply. Hope this helps.