Double spacing after a sentence was used while using a typewriter so that you could see the end of the sentence more easily. The spacing on a typewriter is different than a computer with a word processing application. Either way is correct grammar and is only a personal preference. As for me, I absolutely hate double spaces after the end of a sentence.
Edit: Oh and I cannot wait to visit the UK! I absolutely love british humor, sometimes it is a bit odd but generally hilarious!
Edit: Oh and I cannot wait to visit the UK! I absolutely love british humor, sometimes it is a bit odd but generally hilarious!