MiniMinorMk3

That's one for the stars thread, Marc Bolan and June Child.

Hobbycraft used to do Humbrol, but now sell the Revell range of paints, along with the Tamiya stuff. For Humbrol you could go direct Humbrol UK - For All Your Model Painting and Varnishing Needs or use these guys if you want more than just paints Humbrol Paints I Humbrol Model Paint Range I Next Day Delivery Available (emodels.co.uk)

Parked next to a curb?

Have you thought about a wash of thinned down Humbrol satin black for the base?

The silver 300SE was part of a multi-pack. Mint ones are worth £50-£100 at auction.

The PL is Panhard Levassor

I think the plane is a Bristol 170, it had opening front doors and could swallow cars and take them overseas. Maybe Panhard chartered one to take their cars to motor shows around Europe.

Yes Bugatti is 1/18th scale Bburago BURAGO 3012 Scale 1/18 | BUGATTI F1 GRAND-PRIX N 14 1935 DARK YELLOW (carmodel.com)