ASAP. They'll get away faster if you can plant them while the soil is still warm. If buying mail order, soak the roots in a bucket of water for at least an hour before planting and sprinkle the roots with microrhizal fungae before planting. Make sure the graft union is an inch or two below soil level as this helps strengthen the plant and reduce suckering from the roots.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Anytime between now and the end of March or April (depending on the seller). Some varieties will be sold out towards the end of season but there will be sales. Last year, I got most of my roses in the end of season sale and planted in April.
I got some great ones off one of the shopping channels. A set of five different varieties but you'd need to find out how old they are if you get them off the website rather than the programme as they might have been there a while.
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw