Mighty K bought my bike last year, and he let me in on something I didn't
You can buy a bike, and slap an existing plate on it (that is attached to a bike
insurance policy) and ride around on your new bike, on the other policy for a
period of time to allow you to plate and buy insurance for the other bike.
At least, that is what I recall of the explanation. Who here knows the details
on this to confirm what it what.