We've been making this recipe for a while, it's yummy thanks Johnro.
This morning, I started making it and realised I have only half of the ingredients, so my subs were:
250 sour cream replaced by about 150g cream, 70g natural yoghurt and 60g strawberry yoghurt (cleaning out containers!)
80g milk replaced by 50g milk
No coconut
coconut essence replaced by 1t vanilla paste.
And yet it worked