How to store, and produce, screwcapped bottles

Purple pager David Morgan wrote yesterday (see below) to ask whether screwcapped bottles should be stored upright or horizontal. I was able to get advice from Sir Screwcap himself, Jeffrey Grosset of Clare Valley Riesling fame who is in London to see a new book on screwcaps published today at the London Wine Trade Fair at ExCel. More on that below too.

Grosset, who led the Clare Valley wine producers into the path of screwcap righteousness some years ago, counsels as little change to regular behaviour as possible when screwcaps are substituted for natural corks. This includes continuing to store bottles on...