What are the sleaze scandals facing Downing Street?

How damaging are the claims against Boris Johnson's government, and how could the rows be resolved?

Sleaze allegations against Boris Johnson's government have bubbled away for some time, but been thrust into the spotlight again after the prime minister tried to overhaul standards rules to spare a Tory MP from suspension.

These are the scandals facing Downing Street, how damaging they would be for the government rated out of 10 if wrongdoing is proven, and suggested solutions to uncover the truth: