Lance Stroll says Williams’ car problems equate to up to a 30 horse power deficit.
The British team is stuck in arguably its worst ever crisis, with the slowest car in formula one and boss Paddy Lowe admitting there is no light at the end of the tunnel.
“I don’t expect a lot of progress at Silverstone,” he admitted.
“We are counting on the next package.”
Lowe is in charge of the technical side at Williams, but he said it is no simple thing to set up the sort of structure he put together at Mercedes.