Royal Mail "Signed For" is a huge rip-off and not worth the extra charge. In one respect you were lucky that your post managed to get as far as being logged as Recorded Signed for even if the postie didn't do his job.I also paid for this service and my letter never reached the addressee, nor was it logged as Signed for so there is no record of it apart from my copy of the receipt.I do hope you get a satisfactory answer to your letter of complaint. If you had sent your complaint as an e-mail you would have ended up being given the run around and asked to re-send your complaint without "attachments" even when there are no "attachments" - something to do with their system being unable to read non existent "attachments". I have had three of these "attachments" e-mails from them and they still have not dealt with my original complaint.