XL Bullies do not fit the measurements DEFRA use to determine what is or is not a 'pitbull or pitbull type'.
That is why there are so many and they are not illegal - only the dogs that fit the measurement criteria for the pitbull, are considered to be a pitbull. Genetics and DNA be damned.
(Discounting the other three illegal breeds as they are not found here, nor were they at the time of the ban, but banning 4 breeds looked so much better than just 1).
We will never eradicate large or bully type breeds, whilst we ban based on appearance/measurement - people will just breed something that doesn't fit those measurements.
Breed Specific Legislation such as ours does not work, and has demonstrably been proven not to work over and over again for the last 30 years, here and in other countries.
To do a ban that actually worked you'd need to ban every dog over around 12 inches, every dog with a head/jaw measurement over whatever, every dog over xxkg in weight...
The two dogs, Marshall and Millions, shot in the street last week, neither was significantly bigger than a labrador. They were just average large staffy x mutts.
As for the dog walker killed by some of the dogs in her care - the full investigation is not complete, it is almost certain that her XL bully was PTS first because he has no owner to go home to, as well as any involvement he has in her death. This does not mean he was the ONLY dog who bit/attacked/redirected onto her though, by any means.