A heroic NHS nurse had to spend seven weeks without her 11-year-old son so she could keep treating patients.Neonatal ward clerk Lindsay Sargent wanted to continue working at the Royal Bolton Hospital to help newborn babies and mothers during the coronavirus pandemic.But to keep her own son, Levi, safe from the virus, she made the tough decision to send him to live with her mother, who was at home on furlough leave.It took seven weeks until the relaxation of lockdown rules for the family to