...and I actually got some work done on #4 during the hours on the plane. Continental now has power outlets under the seats, which is brilliant - no battery worries! I added a page to the current chapter, changed its title, and now feel I'm back on track. If only I didn't have to go back to the Day Job tomorrow... oh well.
The first week in Wales I spent in Caerdydd, on a Welsh language course. Tutor was good, and I feel I made real progress (I'm in the nearly-fluent level). We finished up the week at the National Eisteddfod, where I bought - surprise! - a few books. The second week I wandered around, partly in England (Gloucestershire) and partly in Wales (Black Mountains), researching sites for #5. This was out of order, but since I had the opportunity to take the language course in Wales with a group I usually join every other year in North America, I couldn't resist. However, I'm glad to get back to work on the Irish book. I've changed the trilogy name slightly, from Gwernin's Quest to Gwernin's Quests, as I think this middle trilogy is not so closely linked as one quest would imply.
(edited to add: one of the places I stayed... and another)