Businesses in national post activities collect, sort, transport and deliver letters and parcels within the UK. Their work may include operating collection points and postboxes, processing mail at sorting centres, moving items between regions and completing deliveries to homes and businesses. Services can cover standard and tracked post, signed-for delivery, recorded or special delivery, and the handling of parcels of different sizes. Depending on the operator, customers may also be able to arrange collections, pay postage, obtain proof of posting, redirect mail or request redelivery after a missed delivery. Some services include parcel tracking, delivery confirmation and options for sending urgent or valuable items. Postal operators providing services in the UK are subject to regulation by Ofcom, though the services and delivery arrangements available vary between providers.