I had the £350 payment a few months ago and believe this is part of the good condition payment / bonus. I’m collection my new car tomorrow so should get the rest of the GCP and the new car payment. Might get it next week and will let you know if its just the £250 new car payment for now or if I get the whole amount.
I would expect you will recieve £700 new vehicle payment ashortly after collecting your car along with the remaining £250 GCB.
Those that collected their car before the announcement of the increase to £700 new vehicle payment will recieve an extra £500 ontop of the intial £250 we got. It would be silly for MB to create extra admin work if you are collecting after they announced the increase in payment.