Looking good!
Fire service Officer cars tend to be the same model (or couple of models), and they have multiple of that model for officers to use. Unmarked Ambulance cars can be literally anything (well, within reason!). Worth noting just because an Ambulance car is unmarked, doesn't mean it's an Officer's car, some normal response cars are unmarked, as are staff responders vehicles that have either personal cars or lease cars with covert lights. As far as I'm aware, SECAmb CCPs and PPs use some unmarked vehicles and I believe that they are one of the trusts that do operate a staff responder scheme.