Joe;
As you noted, the Floquil "Base Black Figure-Primer" in the 3-oz spray-can is product F330010. Web sites also indicate this same product as FLOF330010 or as FLO330010.
The Floquil Railroad Enamel (comes in the 1.0 oz bottle) I use is "FLO110010 Engine black".
When I Google "Floquil paints" or "Floquil primer", I get numerous listings for e-stores which market these product - lines, so, it is "widely available" via the Web, at least here in the USA. (Purveyors include a range of hobby and modeling sites, art supplies/art paints sites, model railroad sites- MicroMark Tools also sell the stuff.).
I'm getting the impression that shipping paints to UK and importing them into UK might be complicated? I know NOTHING as to the international shipping issues with this stuff!
"www.Testors.com" is the "Floquil" producer company site - and maybe these folks could be most helpful in working a way for you to get some? And maybe some eBay seller will slip it over...
But, frankly, doesn't sound entirely hopeful! You may be better advised to go with something you can get over there and "let this one be"?
@Frank / Hellhound:
Hey! Nice to see other fans of cleaning builds in dish-liquid and water out there! I suggested this a while back at my local club meeting and was met by silence and quizzical stares! It does work well, "But do your kit first, like fine glass-ware, and not after the pots and pans - bits of pasta and cheese hanging around the hatches is a no-go when you paint."
And I also wash the sprues before the build- gets the mold-release oils off before you start. These may be a bit more reluctant than are your finger-prints.
Cheers! Bob