As of March 31st 2014, Royal Mail are increasing their prices and changing their sizings...
Royal Mail 2nd Class Large Letter: up to length 35.3cm x width 25cm x depth 2.5cm
0-100g 73p 101-250g £1.17 251-500g £1.48 501-750g £2.01
Royal Mail 2nd Class Small Parcel: up to length 45cm x width 35cm x depth 8cm
OR length 35cm x width 25cm x depth 16cm
0-1KG £2.80 1KG-2KG £3.80
Royal Mail 2nd Class Medium Parcel: up to length 61cm x width 46cm x depth 46cm
0-1KG £5.20 1KG-2KG £8.00 2KG-5KG £13.75
If your entire order (before shipping costs) equals £40.00 or more a signature will be required and the combined shipping invoice will reflect this.
If one items value is above £40.00 the signature price will already be applied within the P&P charges.
Where an item is over the weight threshold for Royal Mail, the parcel will be sent via Parcel Force 48.