In case useful for anyone else, I made this small table to see at a glance:
MBA £849 - £142 vat = £707 net
MBP £999 - £167 vat = £832 net
MB £1049 - £175 vat = £874 net
MBA £849 - £142 vat = £707 net
MBP £999 - £167 vat = £832 net
MB £1049 - £175 vat = £874 net