Cheers guys, looks like the bit from the bottom of the rad.
I think it probably got totalled a few week back when I crashed into a foot and a bit of water down a country lane at night.
Road was flooded and it didn't look it.
I can confirm this is indeed the lower radiator guard plate.
I can also confirm a foot and a half of water will remove it, as I removed mine in about a foot of water... :roll: