A shop worker from Houghton Regis was robbed of around £9,000 in Manor Road, Sundon on Saturday.
The man was driving back to the Houghton Regis store after collecting takings from other nearby shops when he was hit from behind by another vehicle at about 12.15pm.
Thinking it was an accident, the man got out to examine the damage and noticed a dark VW Golf a short distance away.
The other driver got out and approached him, and then suddenly the van driver was hit straight in the face, causing his nose to stream with blood.
Disorientated, he was led over to a grassed area by the offender and made to sit down.
His accomplice then demanded the vehicle keys from the injured man and unlocked it.
After searching the van they found the takings the victim had been picking up (around £9000), took the bag back to their car and drove off.
The car was found on fire at about 8.15pm the same day in a garage block off Kinross Crescent in Luton.
It been previously stolen in Letchworth and was travelling on false plates of SC10 FUJ.
One of the offenders is described as a white man, about 6ft tall and the other is described as a black man, about 5ft 8.
Det Con Tom Hamm is investigating this case and would like to hear from anyone who saw the Golf being dumped or set alight, or saw any part of this incident in Manor Road, Sundon.
If you can help, please contact Det Con Hamm directly on 01582 394498, or call the 24 hour police non-emergency number 101, text the force control room direct on 07786 200011, or call independent charity Crimestoppers on 08000 555111.