LONDON, Dec 4 (Reuters) - Britain's government is looking at bringing in the military to help keep public services running if key workers, including in the state-run National Health Service, take strike action, the chairman of the governing Conservative Party said on Sunday.Britain is already grappling with industrial action in a range of sectors, but now faces strikes by thousands of nurses in England and ambulance workers in England and Wales who plan to walk out later this month over pay and conditions.But in the absence of that, it is important for the government... to have contingency plans in place," Nadhim Zahawi told Sky News.Prime Minister Rishi Sunak, in power for just over a month, faces a raft of problems, including what could prove to be a lengthy recession in the run-up to an election that opinion polls suggest the Conservatives will lose.Zahawi again blamed Russian President Vladimir Putin's invasion of Ukraine for fuelling energy price rises and double-digit inflation, calling on public sector workers to "come together"."