No, the projector will not operate on b voltage in the UK.
Yes, you just need an outlet adapter to use on UK standard plugs.
Yes, but you have to choose a distance for focus. Very close or very far may be less clear.
"This unit emits 1500 lumens."
Hi Shan - there are many similar questions to yours that have been answered in the Questions & Answers section of the Home Depot web site for this product. There is also a very helpful "Search" function box in the same section that can be used to zero-in on specific keywords. To answer your questions - I didn't find a mention of watts but numerous answers to questions on brightness stated 1500 lumens; and on the resolution question, many answers stated it is HD but it was limited to various format types. Hope this helps.
No internal speaker. A bluetooth speaker comes in the box and this can connect to other bluetooth speakers
yes it can be projected onto a wall ... and you can change the image projection (e.g., reverse) within the projectors menus. Real easy to do
Yes, follow instruction.
Yes, if you hang the curtain flat. No, if you try to follow the curve (will not focus at different distances).