First time registration for an older bike

I'm looking at getting a second DR-Z so I can ride with my son this summer.

I've found one on trademe that looks good - it has the road kit - but it has not been registered before.

It has a VIN plate and number.

It has had a WoF in the past - WoF shows the VIN number, not a plate number - and has expired.

The current owner does NOT have the MR2A form.

Anyone know how easy it will be to get legal for the road - hints and tips gratefully received.

Thanks

=Jim=
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First time registration for an older bike