I haven't heard of any sightings so far this year, mind you the recent weather has been poor to put it mildly. I'm waiting for a decent day this week to have a scan round myself.
In the past I've spoke to knowledgable birders there who say they never post their sightings and also plenty who do post their sightings but clearly misidentify juv Common Buzzards at long distances, so the recent history of birds and sightings around this location is, IMHO, shady at best.
All I can say is in Sept last year I saw three birds together one morning so there is hope. Having said that, I went every morning in that particular week (about 16 hours in a good weather week) and saw them for about 20mins so.........