VRS petrol with leak at back of engine & loss of coolant

Morning All,

I would greatly appreciate some help please.

Started car this morning and coolant level light came on straight away so I filled it up and travelled to work (approx. 5 miles) and when parking the car I noticed she was slightly steaming from grille and when I opened the bonnet there was a small hissy noise from the back of the engine and there is a leak which must be draining the coolant.

Below is a picture and the leak is just below the heat shield

Any help on potential problems on what I am dealing with before I rang the mechanic?

Many Thanks.