Used Parcelforce for 3 days guaranteed international delivery for a super important item to arrive in short time. The parcel arrived after 10 days instead of 3 and I paid fortune compared what would be the postal price with royal mail. In addition to this, I hit customs which cost me additional £75. There were no details on ParcelForce webiste to warn / explain possible additional charges from customs, what are the value bands that hit customs or similar. My item was worth £125 and apparently anything over £100 will be subject to customs and be charged. In summary it cost me £110 for an item worth £125 to arrive in 10 days. To add to the irony, as the original item was stuck in customs, due to urgency, I posted another (same) item via royal mail the week later and paid £13 and both parcels arrived on the same day.