The gov web site says:
A Cant be repaired Entire vehicle has to be crushed
B Cant be repaired Body shell has to be crushed, but you can salvage other parts from it
C Can be repaired, but it would cost more than the vehicles worth You can use the vehicle again if its repaired to a roadworthy condition
D Can be repaired and would cost less than the vehicles worth, but other costs (eg transporting your vehicle) take it over the vehicles value You can use the vehicle again if its repaired to a roadworthy condition
However I was told when I put 55 back ont road that they have just Re-done all the categories. From memory there are just 3 now something like R, repairable B, brake for parts only and S, scrap must be crushed. Don't quote me on the initials as I can't find anything now which surprises me as this supposedly happened when VIC got ditched just under a year ago.
Mike