Prisoners' families Prison Visitors' Guides HMP Styal Address: HMP Styal WilmslowCheshireSK9 4HR Currently, Partners of Prisoners (POPs) deliver visitor services at HMP Styal. Visits information can be found on their website, the Ministry of Justice website or you can ring the main switchboard on 01625 553000. If you are worried that your loved one is at immediate risk please call the Prisoners’ Families Helpline on 0808 808 2003 (from 9am – 8pm Monday to Friday and 10am – 3pm Saturday and Sunday).