This morning I was ringing with Kieron (Offham Blog) (0500 - 09:30).Although we only caught seven birds,two were new Nightingales,both  of which were juveniles.One was in typical spotty plumage,which I would expect in July,but the other bird was so much more advanced into its post juvenile moult.All the spotty body plumage had moulted out,only leaving the pale tip spots to the tertials and outer primary coverts.
When I first looked at the bird,I thought it must be a (5),one of last years birds,but looking more closely I could see the plumage was completely fresh,with no wear at all.
I think some of our Nightingales must be breeding earlier in the season than formerly.