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Besides obscured signage, I'm fairly certain (others will confirm or not) the red signs are not approved. Use of 'term-time' is definitely not approved. Thwen the 'advance' warning sign not only uses 'term-time', but also no indication of where the school streets are other than 'ahead' - straight ahead? that mioght well encourage a motorist to turn left to avoid the school streets.
And you cannot see the definitive signs until into the turn.