I went out simply wanting to knock off the very last little unwalked section of Clanage Road, over by Bower Ashton, which has been annoying me for a while as it's quite close by and I've walked the other bits of it several times. So, my plan was to nip over to Greville Smyth Park via a slightly unusual route to wander Clanage Road and tick it off.
Along the way, though, I inevitably got a bit distracted. I took a few photos of Stork House, a grand Hotwell Road building that's recently been done up a bit (I imagine it's student lets, though I'm not sure) and which I found a reference to in a book about the Port Railway and Pier the other week, and also tried to match up a historical photo of Hotwells before the Cumberland Basin Flyover System laid it waste, which included some interesting markers I'll have to do a bit more digging into...
Or possibly a caravan-park-to-be. This is the old Police stables and kennels, and dog-training ground, I think. There are plans afoot for the Baltic Wharf caravan park, forced out of its home by the plan to redevelop the area as flats (which I imagine will be touted as "affordable" and then turn out to be luxury apartments with at most 5% barely-"affordable" apartments around the back), to this site.
A milestone, perhaps? And there looks to be a benchmark on the bigger bit.
Aha! A quick look at the historic OS maps on Know Your Place finds a marker right on this spot marked "B.S.", which the National Library of Scotland's helpful abbreviations page translates as "Boundary Stone". With that in mind I then had a look on the wonderful geograph site and there it is:
The front stone appears to be an old boundary stone, delineating the Administrative County, Parliamentary County and Rural District boundaries that were part of the Bristol limits in the twentieth century, possibly dated 1897? Behind it is a larger block of stones that may have been part of the Smyth estate further up the hill. On the latter is a partly hidden benchmark.
So I spotted the partly hidden benchmark correctly, too :) There is, of course, a benchmarks directory with an entry for the benchmark itself. What did people do before the internet?
EDIT TO ADD Nearly a year later, I watching a DVD Bristol Railway Stations by Mike Oakley and found out what the larger bit behind the milestone actually is: it's the last remnant of the Clifton Bridge Station buildings, which once faced out onto the road here.
View into the car park of the former stables/kennels. I just poked my camera through a big hole in the gate.