BBC's "Look North" programme today is reporting a higher than expected number of cases of scarlet fever, focusing on a case in Harrogate. A quick search of news through Google suggests it is a problem not confined to Yorkshire, and finds this BBC piece relating to England. Looking at September 2014 - March 2015, and comparing with the same period in 2013-2014, there have been twice as many cases.
Places to look for more information:
Public Health England information (on gov.uk)
NHS Choices information - good place to start if you are worried that someone you know has scarlet fever, covering symptoms, how to stop it spreading, and when to seek medical advice.
Clinical Knowledge Summaries, a summary for primary care practitioners.
For epidemiological information, try ProMED-mail - click search and search for the subject scarlet fever.