Thanks Michael. Looks like the GUI on this model (Lime 15.32.6210-1301005?) is completely different to other Technicolour models (MediaGateway) so I can't find an option to import or export configuration anyway.
Also can't find a web manual, which isn't unusual for Thomson routers it seems, but if anyone has seen one, be grateful for a link. Router comes as part of SSE Broadband connection