Royal Mail 1st Class
Send a parcel up to 1kg for just £3.35 (max. size 45cm x 35cm x 16cm)
Aims to be delivered next working day, including Saturdays
Royal Mail 2nd Class
Send a parcel up to 2kg for just £2.85 (max. size 45cm x 35cm x 16cm)
Aims to be delivered in 2-3 working days, including Saturdays
Whether it's a letter or parcel, you can be confident that your item is in safe hands. You can request a certificate of posting (proof of postage) and every 1st Class and 2nd Class item is covered against loss or damage up to £20 compensation or the value of the item, which ever is lower.
Read more at http://www.postoffice.co.uk/mail/uk-standard#EfdKVid3tBrWo5Pa.99