Can I keep my personal registration if the car is stolen or written-off?

For possible future reference, how can a personal registration be retained if the car is stolen or beyond economic repair after an accident?

How do I make a number plate transferable?

Does the first log book have to state a non transferable number to be so? My family owned vehicle from new back in 1961 has just had the RF60 brown log book changed to a V5 that states the number plate...

What happens if my car with a personalised numberplate is stolen?

If my car with a valuable personalised numberplate is stolen, am I able to retain title to the personalised registration number? If not, do I need to take out separate insurance?