Where was Oh! What a Lovely War filmed?
1969 British musical film directed by Richard Attenborough
Oh! What a Lovely War (1969) was filmed at 3 places in the United Kingdom: Brighton, West Pier and Ditchling Beacon. Every place comes from Wikidata.
Filming locations
Also per Wikipedia's Production section
Wikipedia’s Production section names 1 more place. Each links to the sentence that says so.
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Landscapes & nature
South Downs
England
Range of hills in the United Kingdom
“The 1969 film transferred the mise-en-scène completely into the cinematic domain, with elaborate sequences shot at West Pier in Brighton, elsewhere in Brighton and on the South Downs, interspersed with motifs from the stage production.” Wikipedia