It is hard to write a review of a service that is normally good but that offers nothing when things go wrong. The best thing that interparcel.com should do is to advise customers NOT to use parcelforce to send an urgent letter, and just to use the regular post office service instead. In my case, then this would have saved GBP15 (difference in cost between parcelforce and first class stamp to LIsbon), 6 weeks and counting (as the letter never arrived) and a lot of aggravation. By way of experiment, I sent a normal (non urgent) letter by first class post via the post office to LIsbon and it arrived in 4 days. Worsth thing? The latest attempt at "customer recovery" from interparcel was an email on July 15th telling me to allow a further 30 days for delivery "due to delays". No refund, no apology.