Between 2005 & 2006 20,000 put their sightings and non-sightings to Hogwatch and the results are in and it isn't good.
Sadly the report shows that the numbers have fallen by 20% and in some instances 50%. The report also shows a clear east west divide with more sightings in the east BUT the east is where numbers have fallen most.
A distribution map shows that although still widespread there is no longer an abundance of numbers.
There is more info on the Telegraph website.