Goodness, Jezi, I've been doing the dreaded Christmas card task myself - am a bit confused as to how you happened to be in contact with the wallpaper..
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To remove biro ink use rubbing alcohol over the affected area to remove.
Also try generic cleaning products such as WD-40 to see if that has any joy at removing the stain from the embossed wallpaper. Good luck!
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Ink Stain Removal from Wallpaper
You can remove ink from wallpaper by using either hairspray or lemon juice. Spray the area well then wipe with a clean cloth. You may need to use several applications. Remember to always test in a non-visible area first to be sure that this does not harm your wallpaper.
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babies steriliser liquid. (from Yahoo answers)
the bleach should take the biro out.
use a cotton bud & dab on the biro, do not scrub.
Haven't done the links thing, but these are hints from ordinary people, found via Google - and this is an emergency!