Divorce was the legal dissolution of marriage.
Francine and Clive Jones were divorced at some point after most of their children were young adults. (TV: Smith and Jones) Rory Williams once got Amy Pond's signature on divorce papers, but the Eleventh Doctor arranged a reconciliation before he had an opportunity to file them. (TV: Asylum of the Daleks)
On 7 November 1987, Pete Tyler was late to the wedding of Stuart Hoskins and Sarah Clark at St Christopher's Parish Church, having been saved from the car that would have killed him by his time traveling daughter, Rose Tyler. In response to his late arrival, Pete's wife Jackie Tyler frustratedly threatened that there would be a wedding and a divorce on the same day if he was not careful. Ironically, Pete died later that day as he gave his own life to save Earth from the Reapers. (TV: Father's Day)