The house martins seem not to have returned. I was surveying them last year for BTO, there were at least half a dozen nests and a dozen or so adults. I didn’t see if any fledged, but for seemingly none at all to have returned would be very worrying. Anyone else reported a lack of house martins so far this summer? Could they still be on their way?
Glamorgan Bird Club 
On our BBS 1Km square at Gilfach Goch, previous day 14/5, there were 6-10 birds apparently searching for suitable nest sites by flying up to various house eaves and hovering, suggesting birds just arrived or at least just preparing to nest – although we had seen a few birds on the site on a previous trip 25/4