There was a lot of work done on various tail-less swept-wing configurations by many companies in the immediate post war period, mostly inspired by what was found in Germany.
Initially simple swept wings were researched, but deltas soon appeared with the Avro 707 (1949) and Fairey FD1 (1951).
Historically there have been many cases where similar looking aeroplanes have appeared as the direct result of nothing more sinister than the design teams of the day coming to similar conclusions about the configuration for the job in hand.