A small update, managed to update my firmware to 1300 yesterday. Now SDHC cards work, i have speed limit on maps, and 7 digit post code entry (there maybe more i havent found yet). Super pleased with that outcome.
As ive already bought the CAN gateway, ill install at somepoint in the future, and then look to upgrade my firmware some more, but all in all, glad ive got a more usable satnav now.