Combining my collecting interests in this year's Christmas card. All the best to all my readers and I shall try to be in a better mood next year.
Incidentally, I spotted this while out walking yesterday in the adjoining village of Eastcote, Northamptonshire. I am not an expert in the field of British Post Boxes but I haven't seen anything like this before so guess it must be some new type. I am sure that every other box I've encountered has an embossed EIIR symbol. This shiny metal plaque looks a little less important.
No doubt someone will bring me up to date on these things. A quick Google image search didn't reveal much but I ahve also shared the picture on twitter @GBMachins so that'll probably get some comment too.