Royal Mail Delivery: In the UK is available on items of 0.5kg or less.
Royal Mail International Delivery: Is available on items of 1kg or less. Royal Mail International deliveries cannot be tracked in real time and information relating to shipment once in Royal Mail partners' possession (your country's postal / mail service) is subject to 20 working days wait before the partner mail service is obliged to investigate.
DPD Premium Delivery: is a tracked service offering a tailorable 1 hour delivery slot to UK & European destinations. This is the default service for orders above 0.5kg delivered to UK destinations, and for orders above 1kg delivered to NON UK destinations.