Philips (Thorn) 70w T8 tube made in Britain

Pictured at one of my local lamp bins - sadly I didn't have the space to carry this one back home, shame as British made Philips T8s seem to be incredibly rare with most being imported from the Netherlands and later Poland! Does anyone know which factory symbol this lamp has? I suspect it was made for Philips by someone else and didn't come out of their Hamilton plant. (Edit: Thorn made)