I think that's going to need painting properly, by a accident repair specialist.

Don't go to a dealer - in most cases they just farm the work out to a local independent, and then whack 50% onto the price.

Ask around, facebook, etc. for a good local independent bodyshop who can fix it for you, then go and see them and ask for a quote, explaining that it'll be self-paid rather than an insurance job.

As to the cost ... less than £200, I'd guess. That'd include pulling the dent, repainting the bumper and wing. Though it's impossible to say for definite - if (for example) fixing clips are broken on the inside of the bumper then it might need to be replaced, or plastic welded.

I can't see the pic, Photobucket no doubt.

However i agree with the other posters, you need to find, preferably by recommendation, a smaller indy bodyshop, smaller the better, and form a relationship with them, sure as eggs are eggs you'll need their services at various times over the years.