What's happened to the GB sticker?

I have seen several vehicles on the road displaying a UK sticker to identify its country of registration whereas I would have expected a GB sticker. Why is this?

Are EU number plates legal in the UK?

I have a 2020 MINI. The number plate has the EU flag on it, which must be illegal when travelling in Europe. Do I need to change the plate and get one with a GB flag on it?

How do I get an 'anti-pollution' sticker for driving in Paris?

It was recently reported that you need 'anti-pollution' stickers, which cost £3.70, when driving in Paris or risk a fine of €135. Do I need them for going to drive to Paris next week and how can I get...