Looks almost identical damage pattern to when my 2 week old mk5 Golf got clipped by a bus (apart from the additional damage caused by pushing my car into the car in front). New rear quarter panel, new wheel, new rear bumper, new rear axle (the wheel is facing slightly away from straight isn't it? Or is it the stoved in bumper making it not look straight?), maybe some new componnents attached to said axle - about £8k damage. Make sure you check the colour match in all lights - pearl black can be a bugger to match, more noticeable in overcast conditions.
After seeing the perpetrator on the way to the police station, do you yhink they'd stopped to wait and see if you'd come back (as you'd left the roundabout one way and they another) or was it a genuine hit and run?