Don't know what is going on today but driving from Oxford to Didcot this morning I counted half a dozen 1920-1940's Rolls Royces and just seen a similar aged Bentley on French plates in Woodstock.
Yes - the annual rally was in Northants over the weekend and that may have been the French contingent making their way south (there were lots of continental members who drove their cars up and are going back this week).