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The distinguished architectural writer Gillian Darley retraces the story of "Subtopia", one of the most significant architectural debacles of the post-war era, and considers its long shadow.Her story starts with Ian Nairn, the maverick young architectural journalist, who invented the word "Subtopia" in the mid-1950s, when the Architectural Review ran a campaign against unsightly clutter and the blurring of distinctions between town and country.Nairn drew upon a recent road journey he had made, stating that the outcome of "Subtopia" would be that "the end of Southampton will look like the beginning of Carlisle; the parts in between will look like the end of Carlisle or the beginning of Southampton."He continued uncompromisingly: "The whole land surface is becoming covered by the creeping mildew that already circumscribes all of our towns. Subtopia is the annihilation of the site, the steamrollering of all individuality of place to one uniform and mediocre pattern."Gillian Darley brings together lively original archive featuring Nairn himself, Gilbert Harding, Sir Hugh Casson, Sir John Betjeman and others, to re-trace the story.She talks on location in Southampton with the architectural photographer Gareth Gardner about his new project to re-trace and photograph once more the locations which Nairn visited. In studio, she explores the original and contemporary picture with the architect Janice Murphett, and the architectural writer, Gavin Stamp.And she wonders whether, if the short-lived and unhappy Ian Nairn were alive today, what would he feel about the British landscape?Producer: Beaty Rubens.

Google dominates internet searching across most parts of the globe. The algorithm which produces its search results is highly secret and always changing, but is crucial in influencing the information we all obtain, the viewpoints we read, the people we find out about, and the products we buy.It dominates the market because it's so effective. Rivals find it difficult to compete. But however good the algorithm, however carefully crafted to give us what Google thinks we actually want, is it really healthy for one search engine, and one company, to have so much impact?Rory Cellan-Jones explores Google's uniquely powerful role at the centre of today's information society.Producer: Martin Rosenbaum.

Writer and activist Peter McGraith married his long-term partner David in March 2014, the first gay wedding registered in the UK.Two years on he meets gay and lesbian couples and speaks with them about their relationships - why did they decide to get married? Or stay in a civil partnership? And why, for some, will marriage never be an option?Peter explores what kind of effect marriage is having on gay and lesbian couples... and how it might be affecting us as a society, for better or worse.And what does the marriage, for so long a cherished goal of equality campaigners, look like from the inside? Does it look and feel like heterosexual unions or is it, as some academics believe, re-building the institution from the ground up?Radio 4 hears personal accounts of queer marriage in post equality Britain, meeting couples, co-parents, friends and lovers along the way.Producer: Caitlin Smith