Further to SlowDragons extremely good advice and information, I physically took my results and a list of symptoms to the surgery on Monday morning and handed them over to the admin who assured me they would pass the details onto the duty doctor. Later that day, I received a text message to say that my "letter" had been sent to the relevant department!!Today, I receive another text message, which went like this ........
thanks for your letter - reference ranges vary and pertain to the lab involved. On balance it is fine to increase thyroxine - checking fully the results in 3 months - we can simply alter dose as needs accordingly- 50mcg once daily sent"