Coflein says this about the larger southern ring cairn.........
An oval penannular grassy ring bank measures overall 19.5m (N-S) by c.14m, open on the E where there is a gap 6m wide. The stony turfed-over bank has a maximum width of about 6m and an average height of c.0.5m. On the N part of the ring bank are set two small boulders, 2.5m apart, which appear to flank another gap though, in fact, the bank between them is only slightly lower than elsewhere. The interior is uneven.
and this about the smaller one.......
A slightly oval ring bank surrounding a sunken interior lies adjacent to a farm track.
The overall dimensions of the feature are 13m (N-S) by 12.2m, the interior 6.5m (N-S) by 6m. The crest of the stony turf-grown bank is 0.2m high above the exterior but 0.75m above the sunken interior. A small stony mound lies adjacent to the bank, on the NW.
Coflein also calls them possibles, but that they are bronze age funerary monuments.
Easier to find than I anticipated, though their not on any map but you'll still need an OS map though.
They are wildly different in size, the larger one is like many other ring cairns I've seen but the smaller one is, well, its very small, and that sunken interior. There are stones poking out of the grass where the smaller one abuts the farm track, weather they are part of the cairn or part of the road I couldn't say. This may be private property but I encountered no people and no barriers.