I would try a local hardware store, if you don't find anything there try a store such as Wal-Mart or Target they will find what you need for you so you can get in and out in no time at all.
If you buy an adapter
yes
I should be able to with an adapter.
The voltage in a UK outlet is about twice that of a US outlet, which means you could ruin your sewing machine trying to plug it in. In order to use your US sewing machine in the UK, you'll need to purchase a voltage converter (transformer), and then you'll need to buy a UK adapter (since the transformer plug doesn't match UK outlets).
Check your laptops power adapter to see if it will handle both 240v(UK) and 110v(US) if it can handle 240v (which I believe most can) then all you need is a UK plug adapter.
An iPad that you buy in the US will be just as functional as one you buy in the UK. Remember that you have to get a power plug that works in the UK.
You may have to buy a European DS charger from the Internet.
Vnsport Universal Travel Adapter 45W PD Support fast charging and QC3.0 USB Type-C for USA EU UK AU Plug all in one 3 USB universal adapter travel charger 200+ Countries
Target, Walmart, Toys R us, or Best Buy.
uk
Yes, a digital camera bought in the US would work in the UK or any other country for that matter. You would have to buy an adapter to plug into the wall when you use your battery charger (if you use rechargable batteries) because the electrical voltage or frequency or whatever is not quite the same as ours in the US.
Yes it will, although you have to buy Microsoft's official wireless adapter. http://www.xbox.com/en-US/hardware/x/xbox360wirelessnetadapter/