With the addition of the new cell van, it is rather unfortunate these weren't updated accordingly.
Currently the "Police car" ARR only calls IRVs
(which is an improvement compared to before where it would call PSUs, Mounted Units, M-RAVs, Firearms PSUs, Multi-Dog Carrier, Detention Vans and IRVs)
but this means the new "Cell Vans" aren't dispatched as IRVs despite them being used in abundance in Local/Response Policing
I would propose a few new ARRs to help fill this role:
IRV (Just IRV, as is now, renamed)
Cell Van (Just a Cell Van, as is now)
IRV or Cell Van (Only the IRV or Cell Van - nothing else)
Any Police Car (All Units including ARVs, DSUs, Traffic, Public Order etc)
This would help mirror other policing ARRs which do have options like "Any Firearms Unit", "Any Traffic Car", "Any Dog Carrier"