This is the Novotel Hotel on Herbert Street, Cardiff. It looks north out over what was (until recently) the Tyndall Street Industrial Estate, and south it overlooks the surviving Junction Canal, which linked Sea Lock Pound with the two Bute Docks.
If you’re reading this in the RSS feed, my original blog post also includes a Google map showing where this photo was taken. Unfortunately I haven’t managed to get the map to appear yet in the RSS feed, so for now you’ll have to click through to my blog if you want to see the map. Sorry.