HS2 contractors say they plan to press ahead with digging tunnels to Euston, despite the Government having effectively sent the high-speed link to central London crashing into the buffers.Prime Minister Rishi Sunak last month ordered the cost of the Euston leg to be reduced by £6.5bn – meaning it will only be built if it can be part-financed with private investment.The order to cut costs – alongside the axing of the Birmingham to Manchester section – was despite years of preparatory works having turned Euston into a vast construction site.But during a HS2 media event on Wednesday, designed to showcase the vast amount of work continuing on site at Old Oak Common station in north-west London, tunnelling contractor Skanska Costain made clear its intention to start digging towards Euston in 2026.