Ms Ashby told PA that it felt "surreal" for the album to be released after many years of performing with the act: "I've been working so hard for 10 years building this up and now everything has come to a head.
"It feels right to have the album come out this year with the 100 years of remembrance.
"We started just doing residential homes, which we still do now. A lot of people that are in those homes are veterans or women who contributed to the war effort.
"I always knew that there was something special in what we were doing because of the reaction we got from the people in the homes.
"When we sang those wartime songs you could see the way it evoked such memories and emotion in them.
"Even from the younger generation that were booking us, 'oh what a lovely thing that you are doing to give to this generation'. It touches a lot of people I think, from all your generations.
"I don't think there are many songs like that which are about a specific period of time. They got people through those days. There is nothing really like them."