Yes you're right Sue Donin, definitely James Cordon driving, anyone who saw him in "One Man Two Guvernors" will know he applied his method acting skills to that role and somehow has continued in that vein in real life. So on the one hand he is a highly overpaid well remunerated talk show host in the US but flits back across the Atlantic to drive Her Majesty around, because we have it on good authority she needs the right people around her. Possibly this is a covert role so he can keep her up to date as to when the next big moanathon interesting discourse with a US talk show host is coming down the line, his kids, we are told, enjoying playdates over at H&M's place, they're bound to discuss that whilst moulding something meaningful with ethically sourced sustainable play dough or whatever!
