Before you ditch the idea I think Clubman has something that you need to consider:
If you bought the original place and that is a matter of fact, then it is possible that your wife could qualify as a 'first time buyer' for stanp duty.
Instead of using the new place as the rental opportunity, you would occupy that house as PPR.
Again, sometimes folk dont give us all the information necessary, so this assumes that if you did buy the house that there is no clawback.
Hope that helps