Don’t trust the local importers to make an appointment for you - 50% of the time they forget or just won’t do it for consumers (unless you are a retailer or restauranteur) -
E-mail them direct, and tell them the times you are available - if you don’t hear from them back - send it again and again - these bigger firms usually have set times on their tours - so it won’t be hard just reserving a spot on one of those tours - good luck -
All in Tain
Jaboulet and Chapoutier have store fronts you can walk in and taste.
For the Jaboulet Chapelle tasting (3 wines 50 Euro) you can reserve ahead of time as well as eat lunch at the store front. This was the only place in the Rhone Valley I had to pay to taste.
Chapoutier will also take a reservation and do a tour at the bottom of the vineyard. Since I was a big fan of their wines they let me taste a couple of expensive ones including the Pavilion.
Delas was the best of the three. Tour of the domaine followed by a long lineup to taste back at the store, including Tourettes and Bessards Hermitage.
In Ampuis Guigal was closed when we went but went to Jamet (which was brief) and Rostaing and tasted about 4 or 5 wines.
Second the recommendation of Yves Cuilleron. Another option could be Francois Villard.
Only issue might be that as these guys work vineyards spread far from Côté Rôtie to Saint Peray they might be tricky to nail down for a meeting…
René Rostaing is a great guy, but he has only one white Northern Rhone (Condrieu La Bonette) … and also he has retired and his son Pierre is in charge now (who has very littel time usually).
However if René is available - always worth the visit …
You might also try Stephane OGIER, he has more whites and many reds … and his new state of the art cellar (just south of the Ampuis border) is marvallous: http://www.stephaneogier.fr