Hospitals in England, Wales and Northern Ireland cancelled between 40 and 60 per cent of elective procedures, such as hip and knee ops, when up to 100,000 nurses joined the picket lines.Hospitals in England, Wales and Northern Ireland cancelled between 40 and 60 per cent of elective procedures, such as hip and knee ops, when up to 100,000 nurses joined the picket lines.Read MoreHealth News | Mail Online