i drove with no dashboard for about 6 months. spoke to police a couple of times (about to go home from the pub on friday night after a pint!........). they were interested in it, asking if i took it on track etc.
they said because i've not actually changed parts its not an issue, but if i'd put a carbon one in or something they'd want to see it on the insurance doc.
no standard parts changed = no police trouble, at least, around my end. police must be nice here eh?!