was that town affected during world war ii?
No.
Keynsham
 After the flood the Memorial Park, which had been laid out after World War II was extended.

what is keynsham? It is a town and civil parish. in which country is it located? England. was there any evidence of romans living in historical times in that town? Yes, it may have been the site of the Roman settlement of Trajectus,
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Keynsham [SEP] Post World War II
To obtain the system, listeners had to write to Batchelor's Keynsham post office box, and Keynsham was always painstakingly spelled out on-air, with Batchelor famously intoning "Keynsham – spelt K-E-Y-N-S-H-A-M – Keynsham, Bristol". This was done because the proper pronunciation of Keynsham – "Cane-sham" – does not make the spelling of Keynsham immediately obvious to the radio listener. Since the 1950s Keynsham has become a dormitory town for Bristol and Bath. The High Street shopping area has been remodelled, and a Town Hall, Library, and Clock Tower were built in the mid-1960s.