Hi Lee,
I have a 2011 XF-S (3.0L, Portfolio spec).
I can't help with your lack of DAB radio, but there have been a few threads on here discussing such upgrades.
As for USB ports, there should be 2 in the storage area under the centre armrest.
SatNav upgrades...
The DVD drive for the satnav is in the boot, on the nearside. I got a DVD from www.latestsatnav.co.uk, worked perfectly! Cost: £29.99
Sorry about the DAB, but I hope the rest of the above helps.
Cheers
Jon