Eastern Lesser Whitethroat?

On Wednesday 13th April, a really early start with skies leaden with a slate grey cloud threatenning rain at any time, Kessingland by contrast was brighter and I parked near the beach and walked along the concrete path running adjacent to the beach just 50 yards south of the Beach cafe. By the flowering, at 6.55am after just a minute's wait I saw the possible Eastern race Lesser Whitethroat moving through the bush. Indeed during the next 40 minutes I saw it 3X usually obscured by foliage but at 7.30am it came out almost into he open feeding. It "takked" a few times aiding me in locating it. Was it an eastern form? It certainly had a pale brown mantle a feature supporting Eastern but I couldn't really see any extensive white in the tail, but this feature is probably difficult to see unless you see the bird really well. Most of the time it was partially obscured or when out in the open it was seen side on so difficult to ascertain these feature. One photo appears to show an almost completely white out tail feather on one side. The jizz of short wings and long tail I couldn't really see although the photos tend to show an abraded tip to the tail. The jury is still out unless we can get more views/ photos of it. Then I saw 8 ducks flying overhead and south with a really weird "whistling call" I was perplexed as they were obviously escapes but I tentatively think 7 of the 8 were Fulvous Whistling Ducks not sure of the larger duck with them as it wasn't seen very well, might have been a Mallard type? Checking Kessingland Sewage works it was practically birdless, but a Chiff- Chaff was heard and 4 male Blackcaps were singing on the common and 2 were briefly seen. In the evening at 6pm, in the backgarden 2 Chiff- Chaff flew over to the flowerbed directly in front of the kitchen window and one bird was foraging for insects on the ground here for sometime, really nice to see.