I emailed the website for Google Your Family Tree and asked if there was a scheduled release date for the book in the UK. I had a very prompt reply waiting in my inbox which said there were no immediate plans for a separate UK edition. Unfortunately, this didn't really answer my question. I've replied asking if they know where I can buy it in the UK as I've tried to buy it direct from the website but this only gives options for shipping to the US and Canada.
If anyone knows how I can buy this book then please let me know.