All sorted!
Everyone in the garage including their product genius said it couldn't be done, and this afternoon I even had an email from Volvo saying that the car had a VED engine and not a VEA engine so remote start won't work (I've no idea what they mean by that)
Salesman had the On Call software updated (standard free update, not chargeable) and to his surprise (but not mine) the remote start via app functionality sprung into life.
She's alive!!!!
Deal done and I get her on Saturday. Can't bloody wait!