What did the Brits do to even the research race for the atomic bomb?

The British had a plan, and an agent code named Cheese, in place to sabotage the Norsk Hydro plant on Barren Mountain. If the Germans had no access to heavy water, their quest for the atomic bomb would be slowed. They planned to attack with gliders, but the planes towing them were shot down by the Luftwaffe and survivors were killed. A second team parachuted in on February 16,1943. This was the SWALLOW team. They placed the explosives and departed. They thought their mission had failed but learned much later that they had destroyed the plant.