Thank you for replies/advice to my previous thread
m.mumsnet.com/Talk/childminders_nannies_au_pairs_etc/1465316-What-happens-when
where my previous CM was refusing to return fees I had paid in advance.
An especially big thank you and some 
to the amazing FlissPaps who pretty much wrote my letter to CM for me.
CM has now agreed to return my money ;)