Just as I was despairing and planning on buying laminate cos of a lily pollen incident on my carpet I did a google search. It came up with stain slayer and de-solv it. I had stain slayer in my carpet and thank god cos it got rid of a huge pollen stain.
RESULT! Worth the couple of quid it cost!
Going to give an old tea stain a go when I get a new can!