Just on the facts,

* assisting US offensive actions,

* weapons sales for offensive usage (eg: The UK government admits that Saudi Arabia has used UK weapons, made by companies around the UK, in its attacks on Yemen.)

He is quite correct though. By calling it "defence" industry, it is insinuated that this is always a moral right use of arms. In reality one would have to look on a case by case basis to see which use really qualifies as defence. In many cases I would not call it defence, for instance, if money is used to overthrow other governments and so forth. Or the Falklands War as an example - technically one could claim the UK had to "defence" its territory, but at the same time one has to question the use of colonies in the first place.