I've been thinking, maybe the best way would be to have a £5 flat rate shipping charge on everything and then for item B just add the shipping cost to the price of the product and set it to ship for free. But that really seems like a dodgy way round of doing it and I don't like the idea of some items price including shipping and some not. If there is a better way out there i'm still open to suggestions but if it is practically impossible let me know and I'll go ahead with this method.