So, thank you, nearly there, except logo does not get smaller when scrolling and now overlaps search menu on mobiles.
Below is the code I believe you have recommended in this thread:
/* ----------- fix for logo changing size after helix update START----------- */
#sp-header #sp-logo{height:200px !important;}
@media screen and (min-width: 320px) and (max-width: 767px)
#sp-header #sp-logo .logo .sp-default-logo {
width:80px !important; height:80px !important;
}
#sp-header #sp-logo .logo img{
width:200px !important;
height:71 px !important;
}