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Quick up date, spoken to college who said get a letter in within 4 days of exam - apparently I can write one and so can GP. Spoken to GP who has written a letter briefly explaing condition & mentioning lack of concentration pain related to his various drugs. So mission accomplished - just hope that he did as well as he could in the exam - apparently he had it on his own in the gym as there was no other room available, as after a dyslexia assessment college did, they said that it would help him to say things out loud! He said it was chilly, so they found a little heater to plug in next to him - bless! I think the invigilator is used to him now!