Hey mate,
Can thoroughly recommend KDS Detailing in Gillingham for both dents and any other cosmetic needs you may have. They also have Lepsons next door who are ideal for alloy wheel refurb too.
KDS use a mobile dent guy rather than in house. But had parking door dents (so annoying!!) removed by them. As well as a nasty foot long crease type dent from a bloomin bicycle handlebar. Top jobs on both occasions. No paint needed and you'd never know they'd been there.
Give them a call or drop in if near you.