So after a brief internet search and a call to Aylesbury Ducati (thank gents) I now have the two instrument panel covers, at £20 including the courier cost I can absolutely say money well spent, makes the instrument panel area much tidier. Not sure of these are standard on the 1299. Very pleased just need to refit the USB connector a little more neatly.
Darren,
2018 Multistrada 1260S 
Pimpf
Found them 
Threaded Mode