Paul, please excuse this Yank's ignorance. Which box does what?

In the first picture, is the large grey box in the lower right the service entrance?

What are the 3 smaller boxes on top and why does one have three grey cables coming out of it?

I assume the top silver box with the 123 stickers is the cash register, but then what is black box with the display?

The second picture with the unused 3 phase disconnect and the two distribution panels, what are the black things?

Are there two cables cut off just below the storage heaters distribution panel? Are they live?

Thanks for all of the answers.

Larry C