I have put in half of a postcode which it recognises but it will not take the full code !
This is, unfortunately, as good as it gets. I'm not sure if they'll release a future firmware/update that gives full postcode support, but I wouldn't hold your breath.
On several occasions, I've found somebody has given me a full postcode and house number "for sat nav" and I then have to faff around on my iPhone looking up the street and area, so I can locate it on my MS2.1's navigation system.
Essentially, the MS2.1 sat nav is ok but no more than that (IMHO). If you're used to a TomTom, for instance, the factory fit sat nav feels like a big downgrade: no mass input of POIs, no full postcodes, no lane guidance, no HD traffic, etc, etc. On the plus-side, the actual guidance is reasonably good once you've eventually found out
how to enter your destination properly and both 2D and 3D modes are quite pretty looking.
It's convenient not having to faff around with wires and mounts and stuff. Just a shame it's not up to the standard of a good dedicated sat nav unit...
However, the media facilities on the MS2.1 are very good - I use a 32GB SD card for my music and a 16GB USB flash for my comedy/spoken word - enough to keep me from needing to use CDs all the time. It works well, as does the Bluetooth streaming for audio from my iPhone.
