Boris Johnson has denied lying to the Queen over the advice he gave her over the five-week suspension of Parliament.

The prime minister was speaking after Scotland’s highest civil court ruled on Wednesday the shutdown was unlawful.

Asked whether he had lied to the monarch about his reasons for the suspension, he replied: “Absolutely not.”

He added: “The High Court in England plainly agrees with us, but the Supreme Court will have to decide.”

The power to suspend – or prorogue – Parliament lies with the Queen, who conventionally acts on the advice of the prime minister.

The current five-week suspension began in the early hours of Tuesday, and MPs are not scheduled to return until 14 October.