Fair day rate for production-ready repeats

What’s a reasonable day rate to quote for a production-ready half-drop floral with clean separations (8 screens), two colorways, and delivery of indexed PSD + rotary-ready TIFFs? In London I’m being offered £250–£300/day for work that takes me two solid days in NedGraphics/Photoshop plus a strike-off tweak, and it feels light for the originality and print prep involved.

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