Well I've just ordered the dye and will give it a go.
I'll buy the scotchguard (thanks P) once I'm sure I'm happy with the result. If it's a disaster, I can still get them re-dyed that way.

please
__________________
Laurie
xx
I hope that my child, looking back on today
Will remember a mother who had time to play;
Because children grow up while you're not looking,
There are years ahead for cleaning and cooking.
So, quiet now cobwebs go to sleep.
I'm nursing my baby, and babies don't keep.