Apologies,seems I was wrong regarding the non mot'ed bit,but it doesnt need to be taxed.
Some useful info here:
http://m.direct.gov.uk/syndicationCo...14201204270019
You'll see I'm right about the non paying v5 bit,although I must confess the Dvla will take your £25 if you offer it to them,this happenned to me on an astra estate as I didn't know the facts,arseholes!!!