easiest way to fix a broken wheel arch?

[hwyaden]

i managed to crump the back of the bongo into a low (and very hard to spot!) wall last week and the bumper has pushed on the mounting point under the back wheel arch. this in turn has broken a small piece out of the arch where it's been repaired in the past. i knew the arches had been re-done as the paint on the bottom half of the bongo is perfect and the arches look A1 but they're not very strong
can i patch it up with filler or will it need something more substantial?

[Bob]

Really difficult to say without seeing it I'm afraid.

Someone might know a Bongo friendly body shop near you.