All of our physical products will be within one category. I need to set-up weight-based shipping rates which are only available to customers in mainland UK. If the total weight of their order is less than 6, they pay £7.99, then if less than 12 they pay £4.99, and if 12 or over it's free, What would be the easiest way to achieve this in Foxycart? Also, it would be useful if there was a way of preventing customers with non-mainland UK postcodes from ordering. We need to offer 'collection' as an option as well.