Dear Carole,
I am coming on tuesday for 1 stage test in glasgow. NATS says thatafter passing this 1st stage, you may visit any NATS estabilishment and there will e no requirement for that so worry and keep trying any other ATC centres if you cant find in nearby glasgow. BUT definatly try to go.
Only 1 day left so the only advise is, sleep well, dont be afraid
and come to exam, nothing more you can do really.
Good Luck...!