It looks like it was a modest extended Edwardian-era bungalow. Not a Castle, maybe a castle walt.
I must confess to having emitted a small snigger about the Fire Brigade finding the collection of apparently inert ordnance and promptly withdrawing until the EOD people and/or the uncontrolled fire had confirmed it contained no explosives.
I was reminded of the one good quote in The Last Castle (a crap film otherwise); "Any man with a collection like this is a man who's never set foot on a battlefield. To him a Minié ball from Shiloh is just an artifact, but to a combat vet, it's a hunk of metal that caused some poor bastard a world of pain."
Thank you to all those who commented my previous posts.
Our research is getting further and further.
For decade(s) IBA Baltic in Latvia was the main facility and instructors provider for IBA courses, and then, suddenly, - nothing on the Net. Literally nothing. The FB page is dead. The website has totally disappeared. Well, let's guess, - is there any connection with what is described in these articles?