Re Exchange St - maybe there was a Corn Exchange there at one time. Anyone know?
Re Slaidburn - are there any other streets with place names around Slaidburn Drive?
What tends to happen a lot, particularly with newer estates is that they pick fairly generic groups of names & often they don't have any particular connection with the area, or any particular reason.
In Blackburn I lived on an estate which had Leicester, Worcester, Gloucester, Hereford etc.
Similar groups of streets in Clayton & Accy
Whether this is the case with Slaidburn I don't know.