Yup. We've got confuzzeled as to which chicken we/I was talking about. Probably my fault.Light Sussex don't have a crest....at least here in the U.S. Do they in the UK? Somebody in your new flock has a crest (and, crest or no crest, she is a beauty)... and cream legbars were developed in England...so maybe????
https://www.thefeatherbrain.com/blog/cream-legbar-chickens