http://collections.rmg.co.uk/collections/objects/203203.html

I posted a reply to this earlier today !! Have no idea where it went !! May have to look the references up again if the link above is not the correct one !!
These plates were commissioned by Harrods so if you try to look them up using the Wedgwood name you will not find much since they are not a part of the Wedgwood Line !! They are a 1975 limited edition of 1000 !! Harrods did many similar plates and other items from the better mfrs. Many were/are evidently sold as tourist items for those visiting the UK !!
If you search use “Harrods” instead of Wedgwood for better luck !! I think I used “Harrods Commemorative Plates” or Harrods Collector Plates or something similar !! There was one that sold on Worthpoint but I am not a member there so couldn`t see the selling price,, if it did sell !!