Commuters from Cambridgeshire are being warned to expect major disruption across London Underground as workers prepare to begin a strike expected to last until Friday (January 12). Industrial action by RMT members will start on Sunday evening and last until Friday morning. Transport for London says the mass walkout, from January 7 until January 12, will mean ‘little or no service’ across the London Underground network if the prolonged strike goes ahead. Travellers planning to use the tube on Sunday, January 7 are also being warned to complete their journeys by 5.30pm at the latest, in readines…