Am sure there was a post on ArRSe few years back about the Panama Canal, where there was serious complaints about the Chinese workmanship on upgrades that were needing remedial work, whereas the 100 year-old American built sections were still more durable than new Chinese work.The chinks said they could do HS2 in 5 years, the new Huawei 5G system for British broadband is a Chinese system, in which they want to have a controlling share in. Chinese nuclear power stations can and have been built many times quicker than conventional Brit-foriegn consortium ones. Hinckley point is a good example of cost and time over runs.
Edit:- The French and Chinese* have both committed to help in the spiralling costs of Hinckley point, the worlds most complex and expensive nuclear power station, started in 1995, and still not completed.
*They will want a return on their investment, as will the French. one guess where that comes from!