I'll just put on the record that it would be a bit crazy if an order of the House of Commons stopped at, “Well, we sent an email and they didn't reply.”
They have to appear. I think members agreed that they have to appear. I understand that everybody has a different role within this place in terms of what they can do, but we would be making a mockery of our institutions if we just accepted that you could not reply to an email and that's your way to avoid accountability. That doesn't even work for library books, let alone summonses to committees.