Thanks all.
It is Pisa I am considering and it's certified/accredited by the Italian Athletics Federation (FIDAL) so assume this would be ok providing that non UK events are accepted, but that's what I need to find out. Will give VLM a call tomorrow.
kittenkat, I had been planning on the half, but the only one I could find suitable was Gosport on 18th November, whereas Pisa is 16th December giving me more time to train and I think sub 2.45 marathon is more achieveable for me than sub 1:15 half.