One of the reasons Brent Council was so careful about scaling down its budgets from 2010 onwards is the knowledge that there were huge additional costs coming down the line because of things like demographic change and now Brexit.
Brexit will create a particularly difficult environment of Labour shortages as workers are deliberately kept out or removed from the UK. Simultaneously, pay will be going up for legislative reasons, but also I suspect as a result of market forces. We may also see the wholesale exit from provision by the private sector leaving the Council to clear up the mess. This is an existential issue for local government.