"I’ve said before and I’ll say again MI5 does not browse through the private lives of the population at large."
Just those using Yahoo visual chat. Or maybe that was GCHQ, not 5?
"You should not imagine that MI5 is always arguing for new powers or more tools"
No imagination required. We keep seeing them do just that.
I'd like to see him start again and specifically address:
Due process. Maybe he could find a date to tackle this one in June when we'll be celebrating the 800th anniversary of Magna Carta which brought this into English law. Restoring it would be a good contribution to those celebrations.
Presumption of innocence. If the population at large are to be presumed innocent than he doesn't need blanket powers. If he doesn't presume the population at large to be innocent then he should come clean and admit he rejects one of the basic precepts of British law.
Reasonable expectations of personal and commercial privacy. If organisations we use in the course of regular - innocent - communication are to slurp data how does he propose to prevent this being (a) sold for corporate profit by those organisations, (b) sold for personal profit by individuals working in those organisations, (c) passed, for profit or otherwise, by his organisation and his confrères as industrial espionage and (d) secured against intruders who might grab the data to be sold for profit.