You could try getting 'The Stage' from a newsagent. Most companies advertise in here, also register with
StarNow.co.uk - Acting jobs, Modelling auditions, Reality TV casting calls, Dance & Music jobs, Photographers wanted . They have loads of castings and auditions, for all types of entertainment. A lot of the work is London and surrounds, and you may find there is not a lot locally. Although you maybe lucky and find something in the Manchester area.What tends to happen is they call you for a casting and you need to be in London/Essex/anywhere in the southeast within 3 hours, this happened to my daughter a lot and she had to move to London.
Good Luck