The PGMOL, the referees’ body in England, revealed in the aftermath of last month’s match at Molineux – in which Riccardo Calafiori, brought on at half-time as Mikel Arteta reacted to Lewis-Skelly’s sending off, struck the winning goal after Wolves midfielder Joao Gomes had also been dismissed for two bookable offences – that referee Oliver and his family had received threats and abuse from people on social media, prompting a police investigation.