Where/how to get bumper scratches repaired

[JFB2]

I've not had my 64-reg RX450h for long, and momentarily forgot how big it is when I reversed into a pile of (my own) tree prunings. The rear bumper now has three quite deep, 3-inch long scratches on the nearside corner. 

My question is: who should I get to repair them? I've never bothered with minor repairs before, so I'm not sure whether a mobile Chipsaway type operator is a good bet, or perhaps a local bodyshop. Is there such a thing as a "Lexus-approved" repair shop? I want to get a good paint match and finish, obviously, but without spending stupid money. 

Any experiences and/or recommendations much appreciated! I'm based in Winchester. 

[olliesgrandad]

Chipsaway is probably the best option and probably cost around £200