Thanks for the suggestion, London, but I have now ordered from Ebay for speed/simplicity. Will look next time I go spice-shopping. Incidentally, when I was in Abu Dhabi on my last trip, I visited the home of a Tamil-speaking Indian family and was treated to a demonstration of both chapati & dosa preparation. Two points emerged : when making chapati, the cook rolls once, then deliberately traps air inside before rolling out a second time; when making dosa, she used a ready-made dosa mix in liquid form. Both were very successful, and she made their preparation look so easy and simple ... !
** Phil.