A friend pointed me in the direction of these currently on sale at Asda. I know it's an prototype bay but nice anyway! I got one of the Haynes themed ones a few years ago but am liking this one more.
Easy to work out. You need at least one for each show/ vw meet you plan to attend this year, preferably one for each day that you will spend at a show/ meet so for some shows you may need 3 or 4.