Both the then governments were equally guilty of the "unpardonable act of attacking the most revered Sikh shrine, the Golden Temple", he said.
The action had hurt religious sentiments of Punjabis in general and the Sikhs in particular, the 86-year-old 5-time Chief Minister said, according to an official release.
"The Sikhs will never forgive them for this sin against humanity," Badal said on the sidelines of his Sangat Darshan programme in Maur assembly segment in Bathinda district.
Accusing the Congress of inflicting a deep wound on the Sikh psyche, Badal said "it was totally wrong on part of the then government to take support of Britain in dealing with its internal matter."
More From This Section
"On its part, the British government also committed a crime by illegally helping their Indian counterpart on this sensitive issue," Badal said and sought resignation of the UPA government on the issue.
The British government's disclosure showed all the past and present Congress leaders had been "lying" as they had been claiming the decision to mount the operation was a sudden one, the release quoting the Chief Minister said.
British's military role to flush out militants from the Golden Temple was "limited and purely advisory", he has said.