Final update, after 41! weeks DVLA say my C15 requires MSVA, I had it inspected by DVLA back in June and the inspector said as he walked now the drive 'in 7-10 days you will get your log book'
I have spent not only the initial £25, but numerous stamps, phone calls, emails, photo's and time all for nothing. DVLA customer service is shocking, they replied to one email saying something like they would respond in three working days, they did not. When I phone some 20 days latter and asked about the email I was told ' we never respond to emails, it is an automated reply' I asked that they removed it to stop anyone else wasting thier time, but was told NO.
I am now left with a perfectly good C15 that will end up being broke for spares, irrespective of the process, DVLA customer service is abissmal.