As a parent of swimming children as well being involved with a swimming club, I'd say it's not worth it. Children love swimming together, they learn from each other. Unless a child has a specific issue to overcome, I'd say it's best to find the right class for the child. A quiet word with a member of staff with regards to the best swim teacher could help you find the right one. Teachers do work differently and your child might prefer another teacher. As well as this, when learning to swim, they progress at different rates, some faster than others. Peckham has actually some good teachers too so it might be worth looking for the right one.