Coolant Leak ?

[stevelee65]

I've finally got my 04 D5 V70 back from the garage after having the steering rack and pump replaced (it's only taken 3 weeks !!!)
Anyway after being excited about being able to drive the car again I was greeted with the message "coolant level low stop safely" on the way to work this morning.
When I got to work I checked the coolant and it was just below the min
So I topped it up and checked it during the day,the level had dropped again by about 5mm in the expansion bottle after about 6hrs. The car had'nt been driven in that time.
I took the car on a bit of a run after work,no loss of power and temp gauge reads normal. There's no white emulsified oil under the cap or on the dipstick.
Unfortunately during this drought we are having I couldn't tell if it's leaking from under the car,hopefully it'll be dryer in tomorrow and I'll have a look.

So my question is any ideas where it could be leaking ?
I'm hoping to take it for a sniff test ASAP.

Cheers

Steve.