Got the car MOTd yesterday - happy days!!

Went today and finally got the four wheel alignment done - again happy days!!

On my way home realised the steering wheel was not level when the car was driving straight. When I held the steering wheel level the car veered sharply to the left. Not happy days, but I rang the boss of the place that did it and he told me to bring the car back in the morning - fair enough.
When I went out to the car tonight noticed evidence of a leak. Gutted

There was no pool of fluid so whatever it was had stopped and I couldn't see any evidence of where it had come from. I did notice the coolant was low so I topped it up and immediately there was a drip from underneath. Seems to be running down drivers side of the gearbox? First thought would be the HBV (is there a how2?) but wanted to ask if there is any chance something may have been damaged by the bloke doing the alignment check? Also does the HBV simply 'go' so that the coolant just runs out of it or might there be a split pipe or something? I'll get a look at it in the morning when its up on the ramp.
Any advice etc much appreciated. I'm meant to be going on holiday, in the motor, on Sunday
