Thank you Finnie and Birdluv for your replies!
We have separated the two birds (separate cages in different rooms).
School holidays are upon us so we will be able to dedicate more time to them. We were trying to train daily but their bond was too strong and they went backwards rather than forwards.
The male, who has always been more receptive to us has been out of his cage twice today and sitting on our fingers a little. The female is more wary but we are trying to chat more to her and have our finger in her cage even if she avoids sitting on it.
Also, Birdluv, how do I see your whole topic on training? I can only see one post from the link above....