Jodie Comer spent hours naked in freezing water and mired in studies on pregnancy and labour for her latest role. The ‘Killing Eve’ actress, 30, portrays a terrified new mum called only ‘Mother’ in the upcoming apocalyptic climate change drama ‘The End We Start From’ who is desperately trying to keep her baby Zeb safe when she is forced to flee her London home amid disastrous flooding. Its director Mahalia Belo said Jodie, who doesn’t have any children, was happy to embrace the gruelling shoot, which involved braving sub-zero waters near Lochgilphead, in Argyll and Bute. The filmmaker was quot…