>or did you use filters?

It's a custom filter I use, and it's a bulk one, so I can do 30 images at a time.

>about those bakealite light switches

That's what they are called? I have seen them in many an old house, usually the type that's got many holes in the floor.

>Do you have any idea who owns the house?

Other than Miss Collins, no idea. She's likely dead and the house has been left unclaimed.