Very quick update
Horrible pic of Skye but he is now as big as the guppies
Larke is at the bottom of the pic - and she is a stunning little girl.
At the moment she is about 2cms and Skye is now as big as my full grown guppies.
Both are swimming free in the tank with the guppies and will do untill either of them shows some threatening behaviour. So far they tend to sleep together under a leaf, otherwise they go their own way during the day and neither have bugged the guppies and the guppies leave them alone as well.