Dispatcher brings fire engines into the poorer boroughs. It costs only money and follows Growler Boom.
Dispatcher is entry 7 of 9 in the Insider branch, one of the three branches (Ringleader, Insider and Swindler) on the Rooks' 39-upgrade board. It is bought with money and materials, not skill points: £1,500. Before Dispatcher unlocks you need Growler Boom.