Although there are reds, the Loire Valley is more about white wines, some of them sweet. If it is red wines that really interest you, you would be better visiting Bordeaux (although that would be a challenging day trip) or Dijon (for Bourgogne wines, where, although the very best are white, there are many top quality reds as well).
It is the weather that determines where good red wines might be grown terrain permitting, although with global climate change that zone is gradually creeping north (particularly noticeable in Germany).
Thank you both, especially to LoireVeloGirl for confirming one of the groups I was looking at. I've been in touch with Cathy and she's tailoring the tour to our wants.
Around Chinon and Saumur, and east of Angers, there are very good red wines, and far cheeper than in Burgundy or around Bordeaux. That said, it's a matter of taste, and you will not find in Loire valley the same wineyards than in Burgundy or Bordelais, in term of reputation. No "Beaune", in Loire Valley, no "châteaux" , or very small, but reputation is not always quality. In Loire valley, wine is one product among others;Edited: 18 December 2017, 09:37