INSULATE BRITAIN members admitted today that their campaign had failed to force “heartless” ministers to take action —but vowed the group’s next protests would be more ambitious.

The environmental campaigners’ daring road blockages, which began last year, brought major routes to a standstill.

Several members have been jailed for the tactic, but in today’s strongly worded statement the group declared it is “just getting started.”

“It is with an extremely heavy heart that today we have to announce that as Insulate Britain we have failed,” the statement said. “We failed to move our irresponsible government to take meaningful action to prevent thousands of us from dying in our cold homes during the energy price crisis.

“We have failed to make this heartless government put its people over profit and insulate our homes to do our part in lowering the UK’s emissions.”

The group launched its campaign of civil disobedience last autumn in a bid to press the government to insulate Britain’s leaky homes, starting with the poorest.

Five of the group’s activists were jailed at the High Court last week after breaching an injunction by protesting on the M25.

Eleven other demonstrators received suspended prison sentences after taking part in protests on the motorway in October.

Insulate Britain said its next campaign “must be even more ambitious” but stressed this could be off the road — providing ministers meet its demands, which include for government to “fully fund and take responsibility for the insulation of all social housing in Britain by 2025.”