It seems the front image was standard, so I guess the clue to dating will be the back design.
I did E-mail Maritime Archives Liverpoolmuseums and was rather shocked they had no records of the button.
As Ive fount a sweetheart brooch from the boar war (which I will post to the site soon, for peoples enjoyment) and a sweetheart badge after WW1, Im guessing its around that time. But I'm the kind of person who really likes the date nailed down to a year or a few. Rather than a few decades.
Thanks for the input so far, fellow members.
Oh BTW, it was fount in North London, if that interests people