The Mute Swan pair seem to have lost 2 of their 7 cygnets. Good to see the GCG pair now have another clutch after the first was taken by a terrapin. Also present this morning c.20 Sand Martins and 10 Swift over W lake, and Common Whitethroat still singing by W paddock hedge. An ad and a juv Heron were by W lake shore. O/W pretty quiet.
Glamorgan Bird Club 
I was near Cosmeston yesterday after giving someone a lift , we may have even been there at same time. For my first visit in a long time, I had to choose the day when a workman was using a very loud industrial strimmer to cut back the reed-bed from both sides of the boardwalk – funny time of year – which meant no small birds anywhere in that area.
The day didn’t improve. Shortly after this my phone died, and before I got round I got quite nasty chest pains so curtailed the walk. However, before then, I had one mystery bird. It may well have been your Common Whitethroat, but I’m not sure. It was in the west woodlands, somewhere between ST 17211 69060 and ST 17086 69315. I had one brief view from underneath in shadow and noted a white throat, and a grey chest and underparts, possibly slightly streaky or perhaps ruffled feathers. As far as I could see, seemed greyish overall, so more like Lesser Whitethroat or Spot Fly in overall tone impression, but this was in shade. Then some noisy people pushed it much deeper into the canopy foliage. It was giving a tek-tek-tseeee call sequence. The tek noise could fit Lesser Whitethroat, so that’s my working assumption – are there any there? Of course, plenty of juvenile birds around as well to confuse the picture. I may have captured call on my voice recorder, I’ll check later on.
Hi Paul. So basically you were in the first part of Cogan Wood. Never had Lesser Whitethroat, or indeed common Whitethroat there I must admit – the habitat is too closed in in my opinion. The only ones this year have been a fresh arrival in bushes by the entrance to the dog field from the car park, and one singing in a hedgerow by west paddock which is the big field stretching NNW from west lake. I have had both species singing there briefly in the last week.
It shall remain unidentified then.