Not familiar with "Victoria Pink and don't know how the seed is produced commercially, but what you are trying to create or maintain is an open pollinated seed strain and within them there will always be some variations. Forget-me-nots grow naturalized here and there are sometimes a few paler, almost white blooms and a few pinks occurring, but they are rare. I bet the blue is very dominant and I suspect that what you need to do if you want to keep your flowers (almost) all pink is to rogue out every single blue, before they bloom, or do the pollination by hand and protect the flowers. In time with more inbreeding you theoretically should get a more stabile strain with hopefully less and less blue.
Never noticed Myosotis sylvatica to be perennial, but I have grown Myosotis scorpioides and that one was perennial. I had a variegated one that I propagated with cuttings growing in the pond for many years. Here Myosotis sylvatica normally is biennial, self seeding in the autumn and blooming in spring.
