Yes he went to prison, the fine was in addition. CB didn't pay his which is why the blue van was impounded.
Makes me think now, was the reason he transferred the title of the Jag due to him being concerned about having it impounded as well? For some reason I thought AB had the title transferred it to him afer MM disappeared and CB went back to Germany but I'm not sure now. The article linked below has a piece from AB in it and it says he had the Jag registered to him while CB was in prison in Portugal (presumably for the diesel theft). It then reads as though CB transferred it from AB to another acquintance based in Munich of the 4th May.
"At some point I reached the conclusion that he was involved with drugs,' he added, and was in prison in Portugal for two or three months, during which time he handed over the Jagguar car to him.
'When he came out, he was back here quickly, I didn't know more at the time,' he says. Later, he gave the car over to an acquaintance in Munich. 'He always made surprisingly quick decisions,' he added."
Police link jailed paedophile to abduction of girl aged five in 2015