Anyone who knows anything about our latest book Wine Grapes - a complete guide to 1,368 vine varieties including their origins and flavours will know that I am likely to be madly in love with unusual grapes. I was recently treated to a tasting of a collection of them in London by someone who is every bit as besotted by them as me. I describe the tasting in A grape treat  but please regard this collection of tasting notes as a little offering for St Valentine's Day. In the nearly two weeks since that tasting I have been able to add a few more notes to the collection below. My co-author José Vouillamoz very...