A few more ideas that may spark off some new interest in this one.
I extracted a 5 decimal place latitude and longitude from this clue using the same principle as was used on the British Camp Hill Fort Isis. It didn't look convincing at first because it contains a few double digits and the location isn't near any significant place of interest but it lies about 10 yards to the West of the Jack Mytton Way. On looking through local maps and government websites I discovered that this particular stretch of the JMW is also the SW. So by simply taking two blocks of consecutive numbers from the text and ignoring the numbers around them (which I assumed to be disguise) I had a coordinate that was virtually slap bang on the SW. Further investigation showed that the covert in which it lies is part of woods where there is a trail of geocaches, in fact one of them is about ten feet from the coordinates I obtained.
A lot of people have referred to the picture as a rock but I've always assumed it to be an old oak tree. There's definitely one near by because there's a dead oak leaf in the picture. So I was hoping to find the oak tree on the path at that location with the coin at the coordinates to the West (9 o'clock). I discovered that there is a top of the range GPS Handheld called a Magellan Meridian Gold so wondered if the first part of the clue was a hint to geocachers. Alternatively palm (mitt - slang for hand) might be a hint at Jack Mytton, and the JMW waymarkers are yellow (gold). The meaning of 'heart' might become more apparent at the location. So decided to have a day out yesterday and pay a visit. Plenty of oak trees on the path but no waymarkers screwed to them. The only markers are on the standard bridleway posts with the horse-shoe indents on them, and they are JMW markers and local strolls. The location itself is accessible but badly overgrown with brambles and very muddy. I saw the geocache in there (almost fell over it) but no obvious 'heart'. Unfortunately the only technology I had was a TomTom Sat Nav which kept losing its resolution amongst the trees. If it is there its one for hardened geocachers with the correct equipment to narrow down the search area. We had a wander along the path to where the SW breaks away from the JMW looking for a marker like the one in the picture, but nobody in this neck of the woods seems to be bothered to mark the SW. I have seen local walk maps that confirm it to be there, it just isn't uniquely signposted. I think it all depends on whether the picture really is near the location or if it was just intended to name that particular path.
We then decided to check out the Wyre forest and went on the red route circular walk from the visitor centre which takes in the bridleway that I believe is part of the SW. Again the only markers are always on posts (apart from a few kid's trail markers that were nailed to trees) but none of them referenced the SW.
One additional location that we checked out a couple of weeks ago was the beauty spot in Staffordshire which I believe is the only place where the SW and HOEW intersect.
The path here is the only place where I have seen the SW logo markers but we followed them for quite a way and none of them have the blue arrow as well, and they never seem to screw them to trees as there are plenty of existing posts. There is a sculpture trail at this beauty spot (though not specifically on the SW) which has a 'heart' theme. The heart sculpture shown here lies about 15 yards due West of the hand standing man (grease/dirty my palm maybe), but didn't find any coin.
Thought I'd just share these failures. Personally I'm right out of ideas in the absence of further clues. Blow the coin, I'd be happy to see a photograph of a SW waymarker that exactly matches the one in the clue
.