We had wanted to take bikes with us on our travels but we didn't want to take space inside. As we are not avid bikers and just wanted to use them to get about, we were not going to take anything worth more than £100. So, the problem of theft was not considered a major issue.
The obvious choice for the bike rack was the Fiamma Carry Bike 200 as this is designed to fit to the Citroen (Peugeot/Ducato/Pro Master) van.
This rack does involve drilling 4 holes through the rear door to mount the two rails that the rack attaches to.
I had forgotten about the rack and had already insulated and foil lined the rear doors. So, all this came apart for me to fit the rack.
The rack itself folds away to be fairly small and can be detached when not using it to carry bikes.