The Sunday Times informed citing their own resources in the government, Censor.NET reports.
Intelligence chiefs believe that the plane, which crashed last weekend killing 224 people, was brought down by a bomb planted by an offshoot of Isis in the Sinai peninsula.
The group's frontman, Abu Osama al-Masri, an Egyptian cleric, brokered a pact with Isis last year in Syria.
Whitehall officials confirmed this weekend that Masri is a "person of interest" and that Britain would help Egypt or Russia in a "kill or capture" mission. Such a move could involve the deployment of the SAS to Egypt.
Kogalymavia plane A321 from Sharm el-Sheikh to St. Petersburg, Russia, crashed Oct. 31 in the north of the Sinai peninsula. All 224 persons on board were killed.