Thank you all for your advice.

This is what i am planning now. I am going to visit Marissa in March/April for 2 and half weeks.

I am going to transfer 3k from an interest free credit card into my bank account.

We will then aim to appy for the Fiancee Visa in July/August, after having had 3k+ in my bank account fior 6 months +.

Do they check your credit rating? Can they tell if you are borrowing the 3K?
Is this a good route to take?

Thanks

Andrew