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I think the £31.30 ticket is valid via Mansfield and Gainsborough Lea Road (but not via Gainsborough Central ). There's a mapped route traceable on map NH : Nottingham (Mansfield), Worksop (Retford), Gainsborough Lea Road, Doncaster, Scunthorpe.) . Given that you're forced to use the infrequent Lea Road - Doncaster services which avoid Retford ( to avoid doubling back there), there are very limited practical journey opportunities and it's quite difficult to get a journey planner to show it.