I must admit I was rather concerned to read that the Chinese had offered to build HS2 in 5 years at far less cost. I've been on the Chinese Bullet train from Beijing to Xian and it gets its speed because the track is dead straight - they just cleared every obstruction out of the way to achieve this, including whole villages.
However, it's the Chinese standards of construction that worry me. Xian station looks impressive but the drive up to it is restricted because of severe weight restrictions - coaches have to park half a mile away and passengers have to walk with their luggage. One of the other travellers on our tour of China was an Australian civil engineering lecturer and he was horrified to see that the steel reinforcing rods used for the concrete were only 10mm rather than the international standard of 20mm.
At one stop, we were redirected to a new hotel (the hotel we were originally booked in had been commandeered at short notice by the local Communist Party for a conference) and when our coach drove up towards reception, it fell through the driveway - the paving slabs had been laid on dob and dab!
As for safety equipment for the workers, no sign of any sort of PPE, no hard hats, dust masks, safety glasses or safety harnesses or safety rails even though men (and women) were working 60 or 70 feet up on top of pillars being constructed for flyovers.
No wonder they think they could build HS2 quicker and cheaper. I wonder if they still think they could do that if they have to work to UK rules.