End to North Down electoral pact?

North Down Alliance councillor, David Alderdice, has called on Slyvia Hermon to consider her position in the UUP over the decision to accept the PUP’s David Ervine as a member of the UUP Assembly group. Alliance votes proved crucial in the UUP holding the seat, could a long-term consequence of the Ervine decision be a end to this electoral pact?