The Government has now released their definition of an XL Bully. This has caused fear and confusion due to its highly subjective list of points. I do not know who they asked and how they got this written but I doubt they asked any experts who actually go to court to argue the definitions on other banned breeds.
You can read the guidance here
https://www.gov.uk/government/publications/official-definition-of-an-xl-bully-dog
Guidance is awaited on the issue of how the tens of thousands of dogs that are XL Type can become legal and gain their certificate of exemption. This has to go through court for an order to be made to allow exemption of a dog which is the only way to legally own any prohibited breed. There is no way the court system can accommodate all this by the end of January 2024 as directed by the Government.
People with other breeds, other crosses etc are worried that their dog will fall under the category. I read that DEFRA have gone back to the government about this definition as it is is too vague. Realistically, and we have spoken to several police forces, they know a Dogue de Bordeaux is a breed, they know a Rottweiler is a breed and those are not XL Bullies. They know a fluffy coated large dog is not an XL Bully. Whilst the definition is poorly done, the idea that ANY large dog is potentially type is not the case.
We know cops make mistakes, the system is not perfect and many legal arguments will happen before and after the addition of the XL Bully to the DDA list.
A legal challenge to the addition of the XL bully to the DDA has been launched by a group using a barrister. you can follow this on Twitter
A lot could happen by the end of December. We will update as things happen.
Join us on twitter https://twitter.com/Debbie_Connolly
DogLine UK (Safepets) 
Am I reading the nose/head length point correctly, the nose from the tip to the stop is equal to one third the length of the head (I’m reading that as skull) from STOP to back of the head?? I’ve seen an interpretation which states the nose is one third the length of the total head from tip of the nose to back of the head, which is a very different thing! Which is right?! Although at the moment I have 13 “yeses”, 14 “nos” and 7 “no bloody idea” in regards to the type characteristics and my own dog! How am I meant to work out if the shoulder blades are “well laid back”, if the loin is “short and firm” or if the feet are “medium and compact”?! 😥
Sadly these subjective descriptions are what we already have for the Pit Bull Terrier typing. There are now photos of examples and a slightly updated version online https://www.gov.uk/government/publications/official-definition-of-an-xl-bully-dog/official-definition-of-an-xl-bully-dog