Nova
To get the bike registered is fairly straight forward however there is one stumbling block for either new or recently manufactured bikes and that is that they will need to appear on the HMRC NOVA (Notice of Vehicle Arrivals) database before DVLA will complete the registration process.
Getting a recently manufactured bike (as your is) on the NOVA database requires proof that import duties have been paid. This proof can normally be provided by the dealer and / or importer. This could be an issue if the import duties weren't paid by the previous owner when they brought the bike into the UK.
What's sickening is that the NOVA scheme only came in within the last few years, but, DVLA are applying the same "NOVA check" rule to machines that were imported prior to the NOVA database coming into existence. I know this from bitter experience in a recent attempt to get an officially imported 2012 KTM EXC registered. It was a pain in the neck.
For new bikes the NOVA process is completed by the dealer prior to the bikes being registered.
I don't think IVA is relevant as homologation isn't applied to competition machines in the UK.
cheers
Dino