Whether there are any (a) statutory and/or (b) policy bases for vehicles of the Directorate for Priority Crime Investigation (DPCI) to form part of VIP Protection convoys; if not, what is the position in this regard; if so, (i) what are the relevant details and (ii) what purpose would the usage of DPCI vehicles as part of VIP Protection convoys serve in line with the DPCI’s specialised mandate?