Avro CF-100K Clunk
During the mid-1950s it became obvious to the RAF that they lacked anything capable of intercepting Soviet bombers far out over the North Sea, before they got within range for a missile launch against the UK. With existing and planned homegrown fighters either too slow, or too short ranged, this left a dangerous gap in the defence of the UK. Avro came up with a proposal to meet the challenge, with a lightly modified CF-100 Mk5. Armed with four Fireflash missiles the Clunk was able to intercept hostile aircraft well out over the sea. It was finally withdrawn from frontline service in 1968, having been supplanted by another Avro Canada product, the Arrow.