It is a cold, wet afternoon and children sit huddled around a bag of clay making cobra snakes and coil pots. Some are wrapped up in thick coats, while others shiver in thin long-sleeved tops. "We often have to send the children home to put coats on as they don't wear clothes that are warm enough. We hold the sessions even if it is raining or snowing," says Angela Frankham, a play ranger...