The 1957 Defence Review, decided after the political and logistic failure of the 1956 Suez operation, no more cruisers would be modernised but work on the Tigers and HMS Swiftsure would continue, to provide interim anti aircraft support for the fleet until the new County-class GMD's were ready.
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The project was cancelled in July 1957; the decision was influenced by the manned fighter cuts announced by the British Defence Minister, Duncan Sandys.