The heated mounting plate was left behind so it simply looks like the glue holding it on has failed. It now looks like this:
So a new one has been ordered from eBay and I gather it's a simple job to attach based on the YouTube videos I've seen.
Never had a car do this, but then again I've never had a car with a parking brake module totally implode or a 4x4 system be so fussy over tyres etc so I shouldn't be surprised I guess
![Sad :(](./images/smilies/sad.gif)