The correct answer is option 4, Durgapur. Durgapur is an industrial city located in West Bengal, India. The Durgapur Steel Plant (DSP) was established in collaboration with the British in 1955. It was the second integrated steel plant to be set up in India after the Tata Iron and Steel Company (TISCO) in Jamshedpur. The British provided technical assistance and expertise in the establishment of the plant.

Option 1, Bhilai, is incorrect. The Bhilai Steel Plant was established with the assistance of the Soviet Union, not the British.

Option 2, Rourkela, is incorrect. The Rourkela Steel Plant was also established with the assistance of the West German government, not the British.

Option 3, Bokaro, is incorrect. The Bokaro Steel Plant was set up with collaboration from the Soviet Union, not the British.

In conclusion, the only iron and steel plant among the given options that was established with British collaboration is Durgapur.