Take it somewhere else mate, if they have the right equipment and they confident of there work why would he need to drive the car?
I wouldn't let anyone drive my car let alone a raggy arse mechanic!
Place round corner from me charges £49 for 4 wheel alignment and they are seriously the best in our area for anything tyres/alignment etc, go the extra mile to take extra care of you/your car
Got tyres fitted by them on my polished monza's and they placed foam against the faces before putting into bead breaker part of machine and even wash/clean wheels etc afterwards for you, that is the only kind of servicei would accept on my car
Seriously mate demand money back and go elsewhere