One of the first ambulances on the scene when the IRA bombed Harrods on Sat 17th Dec 83 was from Knightsbridge barracks. The duty driver heard the blast, grabbed the keys and took his forward control LR ambulance straight there. He was loaded up, and then set off for a hospital. The closest A+E was Westminster, but by mistake, or not even knowing of the Westminster, he found his way to the more prominent A+E at St Thomas', where AA was on attachment for his combat medic course.
All four were badly wounded, but made it, and Maggie visited later that evening to thank the staff.
Westminster A+E was totally overloaded by the influx of wounded from the bomb, and a consultant at St T's told me the following morning that at least one person probably lived because they were taken to the less busy St. Ts.
Didn't hear Harrods complain then about men in uniform.