I approached via Moretonhampstead but in the jumble of roads and junctions in the middle of the small town I couldn't honestly give good directions to find the lane that leads up to the downs! I can say that it isn't signposted at all and it might have been 'School Lane'(?). I just felt the lane was the right one judging from the OS map. If you then go down and back up a dip, and pass Addiscott on your right you are on the right lane! I left the downs due south, onto the B3212 (which by the way is a really twisty and narrow B road for much of its length), which was really easy so this might be a better way.
This is all Access Land, so you can roam at will. There is a sort of 'car park' at SX762873. If you are coming onto the common from the south west, take the road to the right (marked 'Exeter') and it's 200m up the road on the left. However, all it is is the only tarmaced area on the common. No facilities. In fact when I was there most of it was taken up with mounds of gravel. In reality people park all over the downs as most of the roads have clear spaces off of them at intervals (and they aren't passing places).
There are loads of paths all over the downs. All seem pretty basic and liable to mud. Some might get overgrown in summer. Gorse almost everywhere. The car park is a relatively convenient place to park as there is a clear path up to the top. However this is a bit more of a climb (55m in height in a 500m walk) than from the south end.
The track that is marked on the OS map that goes across the top of the hill doesn't really live up to it's billing and exists only in places as a track wide enough for a 4x4. Some of the time it's just like a footpath, and can be boggy. But it is a convenient way to help find the ancient sties on this hill.
At 356 metres above sea level there are not surprisingly brilliant views from the hill.
A 38.0m diameter stone circle, on Mardon Down at SX 76768719, comprised of 23 stones; two are standing, three are leaning and the remainder are recumbent. Twenty yards to the south is a kerb circle. Plan. This stone circle was first recognised by Dr J Milles in 1752 and he referred to it as a 42 pace diameter stone circle with an 8 pace diameter circle 20 yards to the south. (1)
SX 76768719. A stone circle is on the plateau of Mardon Down at about 1100 ft OD. It consists of 20 stones making a constant diameter of 38.0m. Only 5 stones are upright or leaning, the rest being recumbent or stumps. A further 3 stones lie outside the circle, probably displaced. The upright stones are up to 1.0m high. Surveyed on OS 6". (2) SX 76758716. A cairn 8.6m by 6.2m diameter and 0.6m high. Part of the substantial perimeter kerbing is visible. Surveyed on OS 6".
SX 76738723. An amorphous and unsurveyable mound of stone and earth which may represent the site of a cairn. Maximum height
0.4m, approximately 8.0m diameter. Sited on OS 6". (3)
(A) The stone circle is as described above. It is cut on its S.W. by an old enclosure bank which probably utilized stone
from the circle in its construction. The narrow rig and furrow within the embanked area (a) infers a late Medieval or post Medieval origin (See ground photograph).
(B). SX 76748715. A cairn with a maximum diameter of 9.8m., and 0.6m. high, the top evidently disturbed, but grass and furze covered. Kerb stones, within the perimeter, are large boulders which protrude through the cairn to a height of 1.3m. (These stones are similar to the kerb on Crownhill Down SX 5760) See ground photograph.
(C) SX 76778722. A much despoiled cairn, now grass and furze covered, in an area of loose boulders and outcrop. It is 15.0m. in diameter, generally 0.5m. high but up to 0.8m. high on the north where there is a residual rim. Group surveyed at 1:2500.
The 'mound' noted by Authority 3 is not a cairn but possibly a patch of soil. (4)