Not seen that about before fella. Mileage could well be genuinue a good check over should indicate if it's been 'clocked as everything should show no or very very little signs of wear!!
The bumper may have been replaced after a knock but also as it is a later reg there is the possibility it came from the factory like that as these spats are hard to get hold of unless there is a zed being broken.
Bare in mind that being registered when that one was it could be liable for the extortionate tax the now