When does As Time Goes By return?

As Time Goes By is a British romantic sitcom that aired on BBC One from 12 January 1992 to 30 December 2005, running for nine series and two specials. Starring Judi Dench and Geoffrey Palmer, it follows the relationship between two former lovers who meet unexpectedly after losing contact for 38 years. The series originated as an idea by Colin Bostock-Smith.