Hi all,
I'm a new member, I've been dying to post my thoughts, but had to wait to get activated!
I've spent quite a bit of time on this one, trying to find pics etc that match up in some way.
I too concluded that there might be some 'mill' connection although mills usually are very utilitarian structures (very square), whereas the wall running off in the top left of the pic seems to be at quite an odd angle, more something that you would expect to find in a castle.
However, one mill that at least has kind of similar stonework is 'Staups Mill'. (Google Image it)
This mill is just a ruin, but our picture looks a lot less of a ruin really.
In fact there is nothing in the picture to suggest that its not a whole structure.
As for the holes in the wall, I think that they are almost certainly drainage holes, there is some stainage below a couple of them. This would suggest perhaps a retaining wall? Or maybe part of a bridge or viaduct?
On the other clues, I've not read Great expectations, although it did come to mind, Someone should check that out if they have the book.
The 'Galaxy' clue is difficult. Try hard enough and you can make one word link to just about anything.
On the Chocolate theme though, I believe the current Mars factory is in Slough.
This would put windsor castle as a nearby old stone building, but I'm pretty sure there wouldn't be ivy growing on the walls there like that.
Anyhow, just wanted to put my 5 eggs in, I'll keep working on it, and now I can post my ideas straight away!
The only reason people get lost in thought is because it's unfamiliar territory.