Off-switch

Oooh!



And some Beta-y/Brit-picking comments:

Near the front of the shop a bit of space had been cleared and three round table set out for people to sit and read.

three round tables were set out

It was a different era, but Amy had travelled enough to know that something didn't change no matter how far back in time you went.

some things not something

Another door a little ways further down the wall.

Brit-pick: way not ways

"I asked him you know," Brian said, picking a dishrag up off the facet,

Brit-pick: dishcloth; tap not faucet (though you've written facet, I'm assuming that was meant to be faucet!)

It's simple math.

Brit-pick: maths not math over here

Brian set the damp towel down on the counter.

It was a cloth before, so for the sake of consistency it ought to be again!