Sir Paul McCartney's estranged wife Heather Mills spent nearly two hours at his north London house on Wednesday (29NOV06) filming with a camcorder. MILLS was locked out of the residence in August (06) when the former beatle changed the locks but a source close to Mills claims she had permission to visit last week. The footage is rumoured to be in preparation for the couple's upcoming divorce battle but a spokesperson for Mills says she was merely recording the movements of paparazzi from the window. MCCartney and Mills split up in May (06) after four years of marriage and began divorce proceedings in July (06).