Having spend some time there, I really like the R J Mitchell (designer of the Spitfire) wind tunnel - used to be at Farnborough until they took a section of it to Southampton Uni. Real sense of history using it!

Most of our use is validating sensors for use outside wind tunnels, that is showing our on-bike drag sensors match wind tunnel measurements (it's for serious cyclists and triathletes). Watching live drag (more accurately, CdA) change with body position is fascinating - and tells me my back can't handle the most aero position for more than a few tens of seconds.