Have had a nasty shopping-trolley ding on the rear wheel arch for over 20 years, it was in a difficult double-skinned area.
Adey Shaw from Nottingham, link below, sorted it, he got at the area from behind via rear lights, now looks like new.
Definitely not a DIY type job, so I was happy to pay for his 20 years' experience. Highly recommend him.

Of course it rained!

http://www.dentsfirst.co.uk/

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Great job!

That’s impressive-it’s not an easy dent to get out that either on location or size.

Definitely a skill and art!

I have had several "paintless dent repairs" on a number of cars I have owned in the past.

They never fail to impress me with their "dark art".

Well worth paying the experts rather than trying to do it yourself!

I agree with the above comment, it is definitely a dark art of the dent whisperers.

I have a similar dent on my Rover 416 how much did it cost to repair?

It was £120 took about 2 hrs