UK mainland Parcels are sent by APC on a next day service and for overseas we use Royal Mail International Signed for service.
Tracking for APC is here
Tracking for Royal Mail is here
Postage prices are charged at cost and are typically around £4 for UK delivery addresses (up to 1000g) and for rest of World it is £16 per order (not per item)
If your order comes in before 2pm we can normally get it out the same day
Here's the link to Royal Mail International postage prices