Save yourself a load of messing around...........get the cooling system pressure tested...........the leak will show itself immediatly
 
Sooo... as some of you pointed out it may well be the expansion bottle leaking... it would appear you where correct! Even from those tiny weeny little splits around the neck of the bottle I have fluid leaking from there... Obviously very very slowly, but there nonetheless. I cleaned and dried the bottle initially, and over the weekend happned to look at it and the top of the bottle is covered in red coolant.
My apologies to those who suggested it and I initially dismissed it (being such tiny cracks). Thank you!
 
There may well be another unfound leak but given the small amount the bottle level is dropping I think it may just be from the neck.
 

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