get together 4 vital things
1.log book or reciept for the purchase of the doblo
2.phone
3.form of payment
4. yellow pages
then ring a good locksmith they have 24 hr callout its gonna be a bit pricey but they will open the van and then they usually remove a door lock to make a correct key then reprogram that key to the ecu
hope it helps
Gareth
BTW check your insurance some will pay for this with just a £25 excess and no loss of no claims