>>>they gave him 'suspended' points to be added when he did a licence
Well they shouldn't have done, Eddie! Taking a vehicle without consent can result in a period of disqualification from driving but can't result in the imposition of penalty points on a driving licence.
Assuming it was stranger's vehicle that was involved, Nailit, (rather than, say, hanging on to a hired vehicle beyond the agreed period) then the sentencing range if there was no damage to the vehicle (e.g. through breaking a lock) is from from a low level Community Order up to a high level Community Order. (i.e. there's no possibility of a custodial sentence).
If damage was caused to the vehicle (or if it was taken from private premises, rather than from the roadside or a public car park) the sentencing range is from a medium level Community Order up to 6 months imprisonment. However the 'starting point' sentence is a high level Community Order, so a custodial sentence is still unlikely under most circumstances.
See page 110 here:
http://www.sentencingcouncil.org.uk/wp-content/uploads/MCSG_web_-_October_2014.pdf