Well we found it ! It is indeed a pig-sty; in fact the owner was very proud of it ... its a grade 2 listed building ... looked after by CADW. There is a little walled enclosure outside for the pig to get fresh air; inside there is room to stand up, but its quite a small door for a human to crawl through, and I wouldn't have attempted it if there was a pig in residence !
It can be found on the road from Llanover to Blaenavon, (OS grid ref. 281078 for keen pig-sty researchers) ! It made an interesting morning out, anyway, and we also had a walk on the nearby moor ...
Here's 2 more pics ... first one, pigs eye view of the outside world; second ... Lydarts legs (do you like the Christmas present socks ?!) to give an idea of size of door ...
