Smart paint repairs in herts?

[designforlife]

I've got a small 1.5cm gouge/scratch down to the primer/metal on the rear wheel arch of my integra.

Bodyshops either won't touch it because it's milano red, or want upwards of £500.

I'm considering using a smart repair (chipsaway or similar), due to the small size of the scratch. I don't really want to touch it in myself due to the location, if any moisture gets in around the arches then it's game over.

Any recommendation of a local smart repairer that covers st albans/radlett?