Hi friend, i don't think the rule of Aliexpress could change. The shipping fee caculate rule is set up by Aliexpress. Or you think people would prefer unit price at double increase but shipping fee at twice decline?
I like it this way. Shipping to the UK is not included in the VAT/Import duty limits. So long as pushing for higher shipping costs, means cheeper product costs, it means we can buy without incurring VAT and surcharges.