Police have urged the mother of a newborn baby boy, who was found dead inside a Marks & Spencer bag outside a church in west London, to come forward.A council refuse worker made the discovery after spotting the black bag with avocados on it outside All Saints’ Church, off Talbot Road in Notting Hill, at 12.46pm on Tuesday afternoon.The Metropolitan Police on Wednesday reiterated calls for the mother, who is thought to have recently given birth, to come forward “for her welfare and health”.