I do really doubt they were hen harriers, though they're the closest in look to what I saw, albeit poorly! I thought about Marsh Harriers (along with all the other birds of prey) but I know those pretty well having seen them a lot in Norfolk and they really didn't fit the shape or flight style. I'd be more inclined to think buzzard than marsh harrier but the shape I saw didn't really fit those either. Really don't know at all - wish I was better at identifying birds of prey. They might have been just poorly seen sparrowhawks but if so they didn't look like any of the large number I've seen, they were bulkier and a lot darker on the breast and belly than any I've seen and would have had to be two very large females flying together. I'm leaving them as poorly seen unknowns but I did put up a hazy description, pointing out how poor a view I had, and flight direction on my local RSPB group sightings page in case anyone else saw them and got a better view than I did.
Took another, though less controversial, walk this morning and the place was absolutely ALIVE with birds. Saw a large flock of Redwings, Fieldfares and Meadow Pipits feeding in a paddock, there were really superb numbers of Reed Buntings along the river and ditches (hopefully we'll have a good breeding season to make up for last year as there seemed to be very few Reed Buntings compared to previous years!), lots of Meadow Pipits in the field edges, some Linnets, lots of Skylarks fighting for territory and a pair of Great Crested Grebes engaging in some light courtship display. Also saw a few Grey Wagtails, some Goosanders, Tufted Ducks and more. I posted this to the local sightings page:
1 Yellowhammer, 2 Grey Wagtail (and possibly a third), 2 Great Crested Grebe (engaging in light courtship), 1 Cormorant, 3 Tufted Duck, 5 Goosander, 1 Kestrel. Also seen but numbers not noted: Blue Tit, Blackbird, Black-headed Gull, Carrion Crow, Chaffinch, Collared Dove, Coot, Dunnock, Fieldfare, Goldfinch, Great Tit, Green Woodpecker, Jackdaw, Linnet, Magpie, Mallard, Meadow Pipit (lots in horse paddocks and field margins/ditches), Moorhen, Pheasant, Redwing (feeding with Fieldfares in horse paddocks), Reed Bunting (many seen along river and various watery ditches), Robin, Skylark, Song Thrush (at least 3 singing in various places), Starling, Woodpigeon, Wren.