I recently bought my first Jaguar and it turns out, the air assist valve is just gone, I would prefer to not have to replace the whole throttle body if I don’t have to. I bought an air assist valve on eBay but unfortunately the magnet on it was damaged.

The magnet in question.

 

Buy another one: Try Dave at shop.everydayxj.com

 

unfortunately it looks like they don’t have any there, but thank you for that resource, I’m sure I’ll need them later.