Bentley with UK reg 277M41. What's that about ?

[DippedHeadlights]

Just found a Clarkson roadtest in a 2007 copy of Sunday Times of a Continental GTC. Car has a UK style registration plate with number 277M41 Youth in house just asked and I'm scratching my head. It's not normal DVLA issue or Irish or diplomatic but I have no idea so time to ask the Pistonheads brain !?

[DippedHeadlights]

Thought that but it's not symetrical or relevant to the car ?

[DippedHeadlights]

Oops he's rolled it ! Stupid iPad sorry about that !