I looked on your GSV link, and there are no advance warning signs in either direction. The April 2022 view shows the signs as closed. So is the restriction only at term time ? The July 2021 view shows the signs fully open indicating the restriction. So I see two arguments against the contravention itself
1. No advance warning means it is a dangerous restriction as the turn in is off a busy road, and a right-hand turn in especially so, because what is the motorist supposed to do when seeing the sign ? Jam his brakes on in the middle of the road and back out ?
2. The sign may not reflect the TRO because if the restriction in the TRO is term-time only this should be on the sign. There is a similar situation at Royal Albert Way, where "Flying Motorbike" signs just light-up at the start of the restriction. Not conveying the TRO restriction in the signs is against the council duty in LATOR 1996 Regulation 18