Aerosol paint recommendations

I need to strip back some light surface rust and prime+paint+lacquer the areas in the boot of one of my cars.

It's hidden behind carpet and trim so a 100% perfect colour match is less critical than a durable finish that will protect the metal from future water ingress repeats (the cause of the current rust). However, I would like to at least try to maintain the factory colour so I can't just brush on Hammerite or similar.

Part of me says to just get the Halfords own brand, but this is PH so... Where would you recommend I get aerosol cans for such use?