Yvonne Fletcher

Wouldn't have made any difference if they were.

I wonder if the on duty police-people were given this information. I think probably not.

As an ex police officer, can I say that when you join the police, you sign up in the full knowledge that it can be dangerous.
The job entails protecting life and property.

Agreed - embassies cannot throw their weight around and say who can and cannot demonstrate in public places. Their domain stops at their doorstep.
The person who shot YF and a lot of demonstrators that day was one of Gadafi's henchmen.

This is a free country people are free to express their opinions and demonstrate - if we start preventing that we are on a very slippery slope. The loss of this young woman's life was a tragedy but the blame for it must be on the person who pulled the trigger.

A foreign embassy should have no say over who has the right to demonstrate in London.

Who knows what Thatcher's motives were but I can't for one moment imagine that there was any deliberate sacrifice.