Postbox letter from John
"Can you start on Monday?" isn't something you should be hearing from a school, or any place, where your job is to take care of 'children'. If you have someone start off so quickly without doing at least some basic checks, you're putting those children's safety at risk.
Postbox letter from James
I’m from the UK and due to our privacy laws it’s impossible to obtain a CRC online, or by a simple phone call as in the U.S.