Thanks Kim,

I think I have it fixed. I tried to change the UKP currency to GBP. But, it changed all the prices on the site to zero. I have since added the GBP currency and made it default. This along with a bugfix for paypal IPN has seemed to solve the problem. But, now I have 4 currencies two of which are pounds. This will be a bit confusing.

So, I'm still wondering about changing all reference of UKP to GBP in the db and deleting the UKP currency would be advisable.