I have been out of the picture for a few hours and how far we have moved along! This Lana Coates is certainly an elusive lady.......I do know quite a lot about her husband John - just not about his wife!! - and I think it most unlikely he would have used middle names etc for his marriage registration.
It seems we have rather exhausted the possibilities of finding a birth record for a Lana - or any other variation of this name. Perhaps it was a "pet name" she adopted that was unrelated to her birth name which then makes tracking it nigh on impossible, as all her other records would be in Russia - and hence relatively inaccessible.
But thank you very much indeed Aghhadowey, Loobyloo and Monica for putting so much effort into this search, I really appreciate it. It certainly confirms why i never got anywhere with this!!!