I have changed the way customers who order from our website will pay for delivery.
In the past we have used a complicated systems of weighing the items, then using different prices for different shipping weights. All well and good in principle, but a pain to explain to people and complicated to administer.
Instead we are implementing a flat rate delivery charge of £7.50 per order, whatever the size or weight. There are two key exceptions: 1) A new product in the form of some really nice Ugandan vanilla pods which will carry a flat fee of £1.00 per pack, and 2) If you order over £100.00 from the shopping site carriage will be free.
This is an experiment for the next few months but talking to other businesses who do things this way it seems to be a better option. Time will tell.