Callum is going to be a regular so I take it he is going to end up having a base on the Street, where do you think he'll end up and who else apart from the Platts will he interact with?
Maybe he'll end up working at the factory, or with Owen and Gary: the usual imaginative scenario
And he'll probably end up sleeping with either Katy (before she leaves), Sarah (when she returns) or Maria (she may be with Steph's brother at the moment, but how long will that last), at some point.