London , England ( CNN ) -- Speculation was intense Friday over where and when Prince William will marry Kate Middleton , with many predicting the couple will choose the iconic , thousand-year-old Westminster Abbey . Middleton was photographed leaving the abbey Wednesday night with her parents , and British newspapers reported they had a private after-hours tour . Westminster Abbey is the `` venue of choice '' for the wedding , the Daily Mirror tabloid reported Friday , and it even published a seating plan for the big day . Ladbrokes betting agents seemed certain Friday that Westminster Abbey would be chosen , giving it 1/33 odds . A CNN/ComRes poll out Friday found the British public largely positive about the engagement , which was announced Tuesday , a few weeks after William proposed . Nearly eight in 10 of those surveyed -- 79 percent -- said they believe the engagement will be good for the monarchy . Opinion was split , however , on who should succeed Queen Elizabeth -- whether Charles , who is next in line , or William -- though more respondents said William and Middleton would make a better king and queen than Charles and his wife , Camilla , Duchess of Cornwall . In general , older people and those in higher income groups were more likely to take a traditional line and be more favorable toward Charles and Camilla , compared to those who are younger or in poorer income groups , according to the poll , which surveyed 2,015 adults in Britain between Wednesday and Friday . Westminster Abbey was founded in 960 , with the present Gothic church dating to 1245 . Since 1066 , it has been the `` coronation church '' -- the place where kings and queens are crowned when they ascend to the throne . Its close ties to the monarchy mean it has also been the site of many royal weddings and funerals . Queen Elizabeth II married Prince Philip there in 1947 , when she was still a princess ; her father , King George VI , got married there in 1923 . The funeral service for Princess Diana , William 's mother , took place there in 1997 . Another possible venue is St. Paul 's Cathedral , where Diana married Prince Charles in 1981 in a wedding watched by millions worldwide . Ladbrokes gave that option 10/1 odds , and 16/1 odds for St. George 's Chapel at Windsor Castle . Others have also suggested as possible venues the London church of St. Clement Danes , the central church of the Royal Air Force , in which Prince William serves -- or the Chapel of St. Salvator at the University of St. Andrews , where the prince and Middleton met as students . The palace has said the wedding will take place in the spring or summer of 2011 . The most likely month for the nuptials , according to Ladbrokes , was May , followed in order by July , June , then August . British Prime Minister David Cameron wants a national holiday for the day of the wedding , his office at Downing Street said Friday , though the government must approve that first .
NEW : Poll shows British are largely positive about the wedding . Many predict the venue will be Westminster Abbey . One newspaper publishes a seating plan . The Daily Mail reports that Prince William and Kate Middleton have been spotted at their reception in London, with many speculating on what they might wear to the ceremony.