As a result of Sue's recent contact with ABRSM they have now changed the info on their website re the need for ongoing proof of dyslexia. It now reads as follows.
The supporting document
In accordance with the British Dyslexia Association’s advice, we require supporting documentation whenever we make a reasonable adjustment to an exam. This document can be:
an assessment from an educational psychologist or specialist teacher. The summary pages usually provide enough information for the purposes of our exams, but please ensure it includes information about recommended support or arrangements for exams.
a letter from the Special Educational Needs Coordinator (SENCO) or head teacher at the school, on headed paper.
a letter from the Local Education Authority (LEA), on headed paper.
Once we have a document on file, we will make a note of the reasonable adjustments allowed for the candidate. As long as the code D is selected at time of entry no further documentation will be requested for any future exam, if the adjustment requested remains the same. If any alteration to the original adjustments is requested for subsequent exams, you will need to provide an updated document or the original document for reassessment.