The group have been known to take their protests to motorways across the UK, blocking motorists from driving through.
According to a recent statement, the group would “suspend its campaign of civil resistance” until October 25.
In a statement to the Prime Minister, the group wrote: “Insulate Britain would like to take this opportunity to profoundly acknowledge the disruption caused over the past five weeks.
“We cannot imagine undertaking such acts in normal circumstances.
“But the dire reality of our situation has to be faced.”
After explaining that the group would not be taking any further action until the COP26 Summit, the group urged the Prime Minister: “We want you to make a meaningful statement that we can trust, a statement the country wants to hear: that your government will live up to its responsibilities to protect us.”
It is expected that the ringleader of the group Liam Norton will deliver the letter to Downing Street this afternoon.
More to follow