Thanks for the reply Funky...
I've since discovered the movie 'Russkaya Lolita' has also been released on DVD (though I doubt that 'Blockbuster' would stock it - LOL!), so it is not just something traded via file sharing etc.
The actress 'Valeria Nemchenko' is also known as 'Ashley' at 'Try teens', and she has appeared in two short HC movies, as well as some pic sets back in 2005/6. So I'm inclined to think that the movie is technically legal.
However, we have a bizare twist to the underage laws in the UK, where by even if a girl is legal (18+), if she is made to look too young (because of the way she acts, is dressed and made-up for a shoot), that can be classed as illegal to posess too! So on that caveat alone, I think I'd better delete the movie!