There may be a 'rule' somewhere, but the fact is that it is not a BHX 'rule' - it comes from the MOD.
You obviously missed this part of the debate
, but the following is taken from a BHX press release.....
"BIA Statement Regarding Staff in Military Uniform
Under the byelaws of Birmingham International Airport (BIA), there are no restrictions relating to clothing or appearance for those using the Airport for public flights.
The Airport Company does not Police fashion, nor does it seek to single out or disrespect the uniform of the Queen, or those who wear it.
The Airport Company will continue to support the work of our service personnel across the UK and around the World.
The Airport Company will not automatically refuse to accept military personnel in uniform. "
S78