You can only be dyslexic, apparently, in English and French, or other languages with poor phonetic spelling. It doesn't happen with Spanish, Italian, Hungarian, or anything spelled phonetically, nor with languages whose spellings that have nothing to do with pronunciation, like Chinese.

Some time ago I heard a talk by an expert in Islamic calligraphy who had been brought up as a British ex-pat kid in Iran. Her first spoken language was English but her first written language was Persian. She said there was simply no such thing as dyslexia in places that use Arabic-based scripts - her guess as to why was that words have much more distinctive individual shapes than they do in English.

Practically, what that means for the UK is that if a kid is bilingual in Urdu and English and seems to be having problems reading and writing English, a switch to Urdu literacy learning might be in order.