Compared are the cut UK-VHS by Warner (PG) and the uncut German DVD by Warner (FSK 6).
Difference: 2 scenes with a total length of 2.5 seconds.
Thist entertaining kids movie was slightly cut in the UK to get the PG-rating. It's at least questionable whether these 2.5 seconds actually would have been the reason to not getting the PG-rating. According to the BBFC homepage, the UK-DVD is also cuts. Well, this has been checked and it's not true. The DVD is uncut. There was probably a first DVD edition with cuts, that would explain the information on the BBFC homepage.
When the skin of the main witch's face gets removed, the UK-VHS lacks the beginning of the shot.
The last part of Bruno transforming into a mouse has been removed.