Water leak

While the car was having the springs fitted at garage yesterday we decided to have a look at the water leak thats appeared..
So we did a pressure test and its dripping constantly from behind possibly underneath water pump area?I took a mirror down there to trace it but couldnt see any pipes..does the housing crack or is thier a gasket maybe?

Has anybody had any similar problems and if it is the pump best place to go for one..i heard Euro car parts are reasonable if they stock
Car is 2006 tdci (st) 155

Want to get this sorted before the car is going to be remapped and put on the dyno