Hardly Secret...........
WIKIPEDIA
"Since the 1980s Albemarle has often been used as a stop off point for nuclear warheads convoys on route via road between
RNAD Coulport and
AWE Aldermaston as part of the
UK Trident programme. There is a secure compound located on one of the former runways to keep convoys overnight when required.
[1]"
looking at Google earth there is also a very obvious high security compound right in the middle of the runway
used to see quite a few of those convoys on the M4 wayyyy back -espeically around Reading (I guess for Aldermaston) - haven't seen one in years tho'............