The actual postage cost will be added to your order. There is no 'packing' charge.
Parcels within the UK generally cost £2.95.
Shipments to Europe cost from £4.15 upwards (dependent on weight).
Shipments outside Europe cost from £4.85 upwards (dependent on weight).
Orders of only small shells can often be posted at a special rate: UK £0.79, Europe £2.65, international £3.30.
I generally send orders >€150 by registered mail, which costs £1.00 extra within the UK and £4.80 extra for international. For international orders >€250 there is an additional £2.50 insurance charge.