Mazda 3 was removed awhile back and for some reason hasn’t reappeared.
MX-5? Do you mean CX-5? The MX-5 is the sports car which isn’t on the scheme.
MX-30 current version doesn’t have great range, it’s fine if you only ever do short journeys. The new version with the rotary engine that charges the battery isn’t on the scheme at the moment.
Car History:
Ford Fiesta
Vauxhall Astra Mk6
Mazda 3
BMW 2 Series Coupe
Mercedes A Class
Vauxhall Astra Mk8 (Lease ended early)
Renault Austral