It has to be said
Any centrally negotiated contracts will flounder for the same reasons at the Police ICT Company as for its ill-fated predecessors of NPIA and PITO.
The 43 county forces will simply wait to the supplier's quarter end/year end and then negotiate a price which uses the central contract as the starting point for price. Commission driven salespeeps will always be happy to do a deal based on guaranteed units with approved funding.
NB the HO wheeze which sold off Airwave was dodgy af. Don't ask me how I know!