If doesn't need to be MoT-able or even run to get a new V5C.
Earlier this year I applied for a V5C for my (very) non-running Guzzi. I had to supply a few pics to the Guzzi club who then provided the necessary dating certificate, then this plus a NOVA certificate (which I had to retrospectively apply for, but was issued with no problem) the V55/5 form, two forms of printed ID (bills etc) and the money were sent to the DVLA by a signed-for letter. Too much time and effort invested for the DVLA to then turn around and blame the Royal Mail when it gets lost in the DVLA's internal mayhem.
However, should you apply for the dating certificate from the all-powerful VMCC, expect more hoops and red-tape than the DVLA. Bloody expensive they are too...