Hi Martyn,
Yes , that's the guy alright,i just checked the signature on a web site and read a little bit about the potter.I would love to see some of his sculptures,have you seen any pics of them?
In response to your questions, the vase is four inches tall and to your second question, Sorry i doubt it but it depends on what you have to swap i guess?
Many thanks for naming the potter though, i love having mystery pots when you know that they are quality and then there's the extra fun of finding the maker.This time it's a good'n.
Dan