I pointed out earlier it look like it had a wall cloud with rotation on it, but my observation was dismissed. Sadly I was stuck indoors with a screaming 5 month old, so couldn't go out and catch some video. Hopefully some one in Bedford or MK managed to get a pic or video. The sheer amount of lightning from it accompanied by powerful non stop thunder, squally winds for 2 or 3 mins and weird cloud structures resembling a whales mouth points to possible super cell characteristics.