Church scene

Oh dear. Why can't film-makers get churches right in historical dramas, particularly those based on writers who wrote about religious topics? Although the film is set in London it was filmed in Ireland and the scene in which Mary and Shelley sneak into a church and steal the communion wine is clearly an Irish Roman Catholic church, with a highly decorated altar and statues of the Virgin Mary. An English protestant or non-conformist church of the early nineteenth century would have been no more likely to have statues of the Virgin Mary than it would have had statues of Buddha. There were no such Catholic churches in London until 1878. I realise the film was made on location in Ireland but even there, surely they could have found a Protestant church to film in.