I would go with a home colonic unit instead of a enema. They are very simple to use, no need to get up and make it to the toilet. You just lay back, read a book, watch tv, or whatever and it pretty much takes care of itself. They come with detailed simple instructions and are so easy to use you would not need anyone to show you how. http://www.myhomecolonic.com
sells them and I just got a quote of $78.00 for shipping the unit to the UK.