Firstly can I thank all of you who have replied to my question. I maybe should have pointed out that my partner is my 'civil' partner, so getting rid would be somewhat extreme; involving a divorce!!
I have suggested therapy before, especially after having watched a programme on the telly with a woman who had a frog phobia. Even the 'Evergreen' advert sends her diving behind the cusions!! I'm not kidding on that one either!
Again, I have told her that getting rid of the pond will not necessary get rid of the frogs as they'll just move in under the shed etc (didn't go down too well!!) I know there are other ponds in neighbouring gardens a few hundred metres away and plenty of hidey holes such as raised decking and greenhouses etc around in other gardens, so I guess there would be no escape regardless.
I guess I'll just have to try the therapy issue again!!
Thanks again for all of the responses anyway.