UK - We use Royal Mail Tracked 24 service. No signature is required.
EU - We no longer ship to the EU. New paperwork requirements and customs delays make the process difficult and it is impossible to deliver efficiently and in a reasonable time frame. Some IOSS users in the UK are currently seeing very long delays for their shipments at EU customs so this is not a viable option for us at the moment.
Rest of the World - We use the Royal Mail International Tracked Service. This is an Airmail service. The final leg of your parcel's journey will be handled by your national postal service. End to end tracking is available via the link on your shipment confirmation email.