So..... 4 weeks ago my wife said the car needs coolant as the sign came on. I topped it up a little and marked the bottle to see if it was a leak or actually just low... All good. 5 days later I was on holiday got in it on Monday morning to go to Manchester top up coolant light again, so I topped it up and daringly took it on a 230 mile trip with 5L coolant in the boot. Got to Manchester and back no light, I thought great, Tuesday went to Carlisle probably about another 70 miles round trip no coolant light. Wednesday went to Bowness for wife's birthday probably 100 mile trip no coolant light. Used the car here and there over weekend all good. Wife used car to do shopping last Thursday still all good. Then................ She got in it today and......... Top up coolant light. So the car seems fine when it's being ran out daily but when it sat for a while seems to leak. Any ideas? I checked the coolant daily when I was off work and didn't seem to go down.