Thanks Bryanell !
Do you mind telling me a little more about your experience?
Not much to tell really. The personnel were good, reliable, apparently well trained and knowledgeable, polite, smartly dressed, unobtrusive - in a word - professional.
We never had a serious incident during the year or so that we used their services as bodyguards so we don't know exactly what would have happened had the stuff really hit the ventilator, but they created a positive impression of security and capability.
Can't tell you anything about the cost of the service since we were on a paradiplomatic mission at that time and the service was contracted and paid for by the organisation - but then how do you put a price on personal safety and security. You get what you pay for....pay peanuts and you get monkeys.