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Tom said,

Although you are correct that Stott is single, he is single because of divorce, not because he was never married.

Of course this information is second hand, but it was talked about in Christian circles a few years back.
"John Stott never married, though according to his biography he came close to it on two occasions ..."

For more concerning John's personal life read Timothy Dudley-Smith, John Stott: The Making of a Leader, vol. 1-2 (Leicester, U.K./Downers Grove, Ill.: Inter-Varsity Press, 1999) or you can read his partial biography at Langham Partnership International.