Ah, i put the weight in the shipping method but not in the actual product details. Before i begin to start listing my clients hundreds of products, can i confirm:
In order to apply a standard shipping cost of £3.50 to all orders regardless of how much a customer spends, one must insert a weight (even if its a fictional weight) to each product, then set a maximum and minimum weight in the shipping method. Making sure that the weight in the product falls within the max / min weight in the shipping method otherwise the shipping method will not show?