Hello all!

I'm in the process of planning a trip to France in my 4/4. I think I'm all set, but I'm thinking about the UK badge.

The rear of my car is aluminium, so the magnetic badges are clearly not going to work. My father has suggested attaching a suitable plate to the rear bumper,
but it occurred to me that getting a number plate with the correct UK mark would be both easier and cheaper.

So, my query: do I need the UK on both the front and back, or can I save money and just get a new rear plate?