From the RHB forum :-
"Some overdue bad news to share. John Barnard and Graham Jackson spent a
lot of time in January surveying the col for Raw Head, checking bridges,
roads, fields, railway embankment, canal banks, and even the canal
bottom (with a stick). It’s a very complicated col. Their conclusion is
that (ignoring the railway embankment and canal bottom) the col height
is 78.6m at SJ528439 on sheet 177, and the summit is 227.1m, so the drop
is 148.5m and therefore Raw Head is not a Marilyn.
A real shame to lose this one, and I have been reluctant to accept the
findings but can ignore them no longer. The only thing that can save it
is if we have the col in the wrong place. It is unlikely but possible.
So, for anyone so inclined, can I ask you to see if you can find an
alternative (preferably lower) col between Raw Head and … I think
it’s Cadair Berwyn that is the relevant higher hill. There is a lower
col near Market Drayton that connects it with the Pennines, but it’s the
one that links it to Wales that is the problem.
Unless anyone can come up with something within the next few days then
I’m sorry to say that Raw Head will be relegated to a SubMarilyn.
Hope to hear from those of you who enjoy tracing contour lines. I had
forgotten how difficult it can be in flat areas - I am out of practice.
The good news is that the hill is still there and we are still allowed
to climb it.
The surveyors have helpfully lined up a replacement Marilyn to keep the
total at 1555 - Mynydd y Cwm in the Clwyd Hills: 305m at SJ073767 on
sheet 116. The relevant col is another awkward one, at SJ174677.
The best estimate for the drop is 150.00m ±0.2m so the hill has a 50%
probability of being a Marilyn. Again I have struggled to decide what
to do about this quantum hill - it’s a SubMarilyn or a Marilyn depending
on the height of the furrows in a ploughed field, but not both at the
same time. However, the best estimate is 150.0m drop not 149.9m, so on
that basis it should be promoted. As John and Graham have pointed out,
there are 17 current Marilyns with 150m drop, so it is logical to
include Mynydd y Cwm on the same basis.
I apologies for sitting on these results for so long and trying to
decide what to do about them.