The couple are reported to be planning a Sunday afternoon reception at McCartney\'s house nearby in the St. John\'s Wood neighbourhood.Security barriers have been put in place outside Marylebone Town Hall in central London in anticipation that Paul McCartney will marry American heiress Nancy Shevell there.The couple announced their engagement earlier this year. Shevell, 51, would be the former Beatle\'s third wife.The couple are reported to be planning a Sunday afternoon reception at McCartney\'s house nearby in the St. John\'s Wood neighbourhood.The 69-year-old McCartney married his first wife Linda at the same venue in 1969. She died of cancer in 1998. McCartney\'s second marriage ended in divorce.