I'm pretty sure Splatoon was a group of fields in the UK and Ireland. The actual name of the field could have been License to Thrill and maybe they referred to paintball as Splatoon?
And yes Daystate did sell designs as exclusives to some of the fields. The Skirmish fields had exclusives on I think some of the Ultimark mk series pumps.
Shipping to and from england has always (from my experience) been more than most countries. I think the really challenge would be finding who has these pumps still (edit but that's the fun part isn't it?).
Another interested point that Bryan (BOS) pointed out, is that the SAM prefix on the Sam Patriot stands for "Semi AutoMatic," something I hadn't considered before.