I used to have a white mickey mouse platy. I would imagine that it would be relatively easy to breed out the mickey mouse spots and have a pure white platy, but I've never seen one.
OhFeeshy you asked about the peppered platies, I have a ton of the Salt & Pepper platies. The fry seem to vary quite a bit in appearance. I prefer the ones that have a yellowish upper & whiteish lower body with small black spots kinda evenly dispused over their bodies. Some of the fry are completely spotless and some have so many spots that they amost appear entirely black. Fry body colors also vary from white to yellow, to orange. I would give some to you, but I don't know how one would go about shiping fish that far (across the atlantic) and keep them alive or getting them thru customs. I'm in New Hampshire, USA.