I have been using Interparcel repeatedly to send Ebay parcels larger than the average Royal Mail parcel size. The website is easy to use and you immediately get options according to the type of parcel that you hadn't necessarily thought of, giving flexibility to speed and price. Any problems have been with the individual couriers themselves and not Interparcel - usually due to items not being collected from specific drop off points. On contacting Interparcel these problems have been sorted out fairly quickly - though no mention of gestures of goodwill which would go a long way - especially when you have customers breathing down your neck!