Upvote:1
If you are ordinarily resident in the UK you might not be able to apply in Kuwait.
However, once you have a valid visa, you may enter from wherever you wish.
There are many reasons why you might wish to do that - a lack of direct flights, for example, or a multi-stop itinerary. It's commonplace and won't raise an eyebrow anywhere.
(Thanks to @MarkJohnson for his input)