Lead-based whites in oil

I've asked this elsewhere, without response so far - I use Flake White, when I can get it.  Daler-Rowney used to do a good quality Flake White in both the Georgian and Artists' quality ranges, but since restrictions have been imposed on the way in which lead whites are packaged, D-R seems to have opted out of supplying it at all, at least in UK. 
 
Is there any chance/hope that D-R will again supply lead whites in either of its ranges?  It's possible to get it from other suppliers, but is there really a good reason why Daler Rowney don't supply it?