I have some sympathy for op. You are not necessarily a clinging man hating child abuser if you have some doubts about how your ex will cope with full on full time care of a very small child in unfamiliar environment.
I don't know whether it is 'learned helplessness', genuinely being shit or being disabled by the over clingy mother etc but I have experience of many fathers not being so great at full on care of small children over long periods of time.
My ex left our daughter in a cloth nappy for six hours whilst I was sitting an exam. She had been left in cold soaking nappy for hours. It never occured to him to change her.
When I came home from a day trip and went to freezer to get a pre prepared toddler meal of spag bol as I was too knackered to cook, I found he had eaten it as there was nothing else in the fridge and it didn't occur to him to go shopping.
These are just two of many examples where he failed to even think about her basic physical needs, despite being a highly educated and I assume intelligent man. Hence ex.
So I think there can often be a real issue of concern about just how 'equal' parents are. If the op was really this awful person who thinks that just because she is the mother she is right, do you really think she would be posting here?
But the bottom line is - she is far too young, this is a stupid, crazy expensive idea. She can have any number of lovely,shorter holidays with her dad in the UK.
And btw the English courts are increasingly relying on Australian research which shows that over night stays away from primary carers are not necessarily in the best interests of pre school age children and can be very destablising and stressful. I think this is more work of Jennifer MacKintosh. I have had it used against me a few times now when representing fathers who are not primary carers.