Rewind a bit mate .If you know we don't celebrate thanksgiving then why wish us a good one !.Its like me wishing you a happy St swithens day ,means nothing to you .
Ye don't even celebrate St Withins day yourselves FD.It must be a British thing to not nationally celebrate certain days. Within small communities in Britain it seems ye will celebrate local feasts but as a nation it's like you don't want to nationaly (except Guy Faulks, but lets be honest, thats a commercial thing) be seen to celebrate anything.
Look at us Irish and how we celebrate our national Saint (who was born in France)