 In Scotland, each city has a "Trades Fortnight"; two weeks in the summer when tradesmen take their holidays.Although a strong tradition during the 19th and 20th centuries, the observance of the holiday has almost disappeared in recent times, due to the decline of the manufacturing industries in the United Kingdom and the standardisation of school holidays across England.In 601 AD, Pope Gregory I wrote a letter to Mellitus (a member of the Gregorian mission sent to England to convert the Anglo-Saxons from their native paganism to Christianity) which read