Sounds totally logical to me so why do we have Walker (Appellant) v Innospec Limited and others (Respondents) Case ID: UKSC 2016/0090 going on in the Supreme Court ?

http://www.telegraph.co.uk/news/2017/02/08/unmarried-woman-wins-automatic-right-late-partners-pension/?WT.mc_id=tmg_share_fb