You'll be looking at around £18 total, including shipping. Make sure you select "standard" air mail shipping and not one of the expensive courier options.
According to UK customs guidelines, you don't have to pay duty or VAT if the total cost of the items (*excluding* shipping) is less than £18. Since the mod board costs £13 it's well within this limit.
Mike
(Edited by Mike G at 5:18 pm on Mar. 10, 2002)