Its just a shame that these type of locks are not fitted as standard when the van is new. I know it ups the price but would think that most people would pay that bit extra for a secondary secure lock on the door. As pointed out above the normal lock is strong enough the secondary lock just piece of mind.
Morphy

seen one of those folding handle locks which could help, gain access to eriba if slightly off balance and need a support handle, but folds over door so could be used as security device.
Although if you need a tinkle it could delay opening door
Be interesting to read the 'How to' when you get a 'round tu it' fitting the replacement door lock

Leisure Shop Direct are just up the road from one of
our favourite sites Damage Barton (CC and C& CC)
They have a shop and the distribution warehouse is
just behind. Ordering by post is usually quick and they
do seem to have everything and are very helpful!

My other favourite shop for really good, helpful service is
http://www.thecaravanshop.co.uk/
The owner knows his stuff and was interested enough to phone
me back to see if the taps I bought were ok!!