Schools aren't even open during most of Ramadan, Ramadan starts at the beginning of August and ends at the beginning of September, schools don't go back until 3-5th September and most schools don't schedule swimming lessons in the first week of a new school year as the kids are too busy settling in. Even if Muslim children weren't allowed to swim during Ramadan, and even if the schools did do swimming lessons in September, they only do one lesson a week so the child in question would only miss one lesson out of a whole academic years worth.
Stephanie Kitsune ● 5771d