coolant level dropping

[Renaultsport]

Has anyone had their little red beast loose coolant? I've kept an eye on it lately the past month or so as the level seems lower then before. There are no leaks anywhere and the car was recently serviced (Not by dealer) and nothing popped up then.

The cap on the coolant tank wasn't the tightest in the world so it maybe loosing pressure here but i was interested to see if anyone else has noticed this on theirs.

Ta

 

[Renaultsport]

oh if i dont reply for a while, its because i'm without internet at home for 2 weeks