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https://www.bbc.com/sport/formula1/a...s/c77e1djpg3mo

Both the internal combustion engine and hybrid elements of the new Honda power-unit are said to be well behind the best.

Several sources told BBC Sport this week that Newey said at Wednesday's meeting of the F1 Commission - a rule-making body comprising all the teams as well as F1 and the FIA - that the Honda power-unit could not even recover energy at the lower limit of 250kw, let alone the higher one of 350kw, which comes into force under certain circumstances in the highly complex rules.

Reliability was so bad that by the start of the final day of the test, Honda had only one battery left, and took the decision to limit running to only short runs. A statement said that was to allow them to study data in between track outings, but in the end Lance Stroll did only six laps all day.

The problems with the engine make it difficult to make any judgement on the car. There is no question it was slow in the corners - but the Honda is running so badly that it's hard for the team to work out where the car is, and therefore how to improve it.