Podcast members might be interested in this BULLETPROOF CARS dialogue between me ('Tungsten Kid') and a 'Gareth H' in the youtube comments in 2018 regarding this 'Bodyguard' vid; he seems to know his security stuff etc and I've asked him if he does it for a job, so if he replies I'll edit his answer into this post.
https://youtu.be/HncTXJLGumUTK- Armoured bodywork yes, but they forgot to fit an armoured windscreen
GH- No, they didn't. To make a window bulletproof against an 7.62×54mmR shell would require a UL 752 Level 5 for a single shot and UL 752 Level 8 for multiple shots. That is 6cm thickness and completely impractical for the average ministerial car. So they usually go for a UL 752 Level 2 which is less than 3 cm thick. Strong enough to stop multiple shots from a .357 Magnum handgun, but not from this PSL rifle. It is obviously easier to armour plate the body.
TK- Thanks, but as a matter of interest why exactly is a thicker 6cm windscreen "completely impractical"?
GH- Because it is expensive, heavy, requires a customised made car, which would have very little manoeuvrability in emergency situations. Even the Audi A8 L Security, which is one of the most secure off-the-shelf cars you can buy, concentrates on body armour to protect against bomb damage and glass for shrapnel and small calibre fire. You just cannot buy cars with windows that can withstand this kind of shell to the windows. You have to have them custom made like the US president's state car (the Beast), which costs over a million to make, can only accelerate slowly due it its weight and cannot turn a corner at any kind of speed. It can only travel in motorcades. Hardly practical for driving a UK minister around London.
TK- Thanks, so what you're saying is that the standard procedure when under fire is to duck down into the shielding of the invulnerable bodywork armoured "box" so you don't get your head blown off if rifle fire starts coming through the glass..

GH- Yes, that is exactly what I am saying. Do you think they did not have expert advisers for this scene?
TK- Mind you, if the bad guys get their hands on RPG-type rocket launchers I doubt if even the armoured box could give protection.
GH- It depends on the RPG. Modern versions have shaped charges that will fire molten metal into a vehicle after initial penetration. So, you are right. I would not want to die that way.
TK- Thanks, so to sum up what we've learnt from you, you're saying that although most ministerial cars give total protection against HANDGUNS because the bullets can't penetrate the toughened windscreen and windows and armoured box, the cars DON'T give protection against high-velocity RIFLE bullets that are coming through the windscreen and windows, is that right?....In such a case the occupants would duck down into the safety of the armoured box IF they've still got heads..

GH- Yes. And taking out the driver with the first shot is pretty unprecedented. I don't know of any modern attack where this has happened, you can usually rely on the driver to take you clear. Any defence contractor would recommend going-low in such situations and wait for help. If you are overwhelmed then you just have to give up and hope for ransom. Certainly do not run.