Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
The money now belongs to the pair of you 50/50. Inter spousal transfers are outside the scope of Inheritance Tax (IHT). Any moneys left to your wife and vice versa do not count against the normal 325K IHT tax free limit anyway.
I do hope that I have set your mind at rest on this matter.