Well, since Jubilees already exist and are relatively easy to procure it would be cheapest just to get them rather than to breed from scratch.
Before Jubilees were imported to the US, some breeders created them here by crossing Buff Orps to Speckled Sussex.
Mauve is blue + chocolate. You'll get chocolate pullets from the black hen, chocolate and mauve from the blue, and mauves from the splash. Cockerels will be regular BBS, but carrying chocolate.
They came from Papa's Poultry and I know he has a few different lines of Jubilee's. Like I said though, I do expect rate of lay to improve as day length increases.
English Orpingtons are notoriously poor layers. They've been bred for size, fluff, and color without maintaining productive attributes. Hatchery quality are much better layers although not *good* layers (I consider their rate of lay to be *fair* at about 3 to 4 eggs/week). My Jubilee pullets...