Caterpillar at Decoy Heath, Berkshire

Caterpillar at Decoy Heath, Berkshire

Observation - Caterpillar at Decoy Heath, Berkshire. Description: Saw this caterpillar last week and haven't been able to ID it, does anyone have any ideas? Photo quality isn't too great though.

Saw this caterpillar last week and haven't been able to ID it, does anyone have any ideas? Photo quality isn't too great though.