Loss of coolant

[Nigel Holmes]

I have recently had a warning light for coolant leak.

Having topped it up I the had the emission light come on.

after a few hours that light went out.

What concerns me is the loss of water, the car is 2016 Q5 with 70,000 miles 

 

[Magnet]

Welcome Nigel,

You will need to quantify how much coolant is being used in how many miles. 
Probably stating the obvious, but top up to the max mark when cold, note mileage, check daily, and say top up again after one week - or less if loss is substantial. 
Can you see any evidence of pink coolant deposits anywhere, any evidence of drips on driveway, any signs of water emulsion in the oil? 
Kind regards,

Gareth.