Hangar
You are correct that this is going to cause some western soul searching if this escalates into something big. US and UK armaments being used etc.
It could be argued that the Brits and Americans supporting the Saudis are minimising the civilian damage.
They would be doing this anyway without shiny toys.
Being trained properly to use shiny toys minimises collateral damage.
If BAe etc were not there they would be down the Syrian barrel bombing route, and that is so much worse.