Your verification of 'Little Willie' as tank name has been confirmed to be correct.
Your verification of 'Britain' as nationality has been confirmed to be wrong.
Your verification of 'World War 1' as era has been confirmed to be correct.
so it's correct that it was the "Little Willie", a prototype which was build in Britain. But it states that Britain as the nationality is wrong..
So did I miss something or is this a bug/error?