Not strictly speaking an air display, but a 'display' tac landing in a Wessex in front of Royal party at Aldergrove, who were downwind of LS. Unfortunately troops threw a load of red smoke grenades out whilst disembarking (to capture something or other!). Station Commander not happy as his (and everybody else's) uniform turned a more reddish colour; Royal's outfit started as pastel blueish but finished a much streakier red. I was 'disinvited' to the subsequent lunch!