I think you could argue that the bike should be treated as a new bike in all respects.
MMC completed Tarka in July 2013, but didn't register until April 2014, when the warranty started.
Tarka was driven on trade plates, which made it at least legal.
Your RE was ridden on unregistered = false number plates.
You could also ask the Insurance Company for the premium back, as they were not carrying any risk...
In the end it depends how much of a fuss you want to make.
I think I'd forget it all,and be happy that when it comes to a sale you have won a 12 month relief from depreciation...
