I'm currently onto my second week of annual leave before I start my maternity leave next Monday. However since I have left work (15th July) I have been absolutely hounded by the woman who took over my job asking how to do things and my manager has now text me twice within the last week to go in an help out. It's completely stressing me out, do I have any legal obligation to them? Bearing in mind they have known what date I was starting my mat leave since May?