Thank you for all the input on tortilla warming. We tried re-heating three ways last night. There were willing testers, particularly as we had a whole deboned and KK roasted chicken as taco filling.
Mathod 1 - Steam the tortillas and then heat, two by two per @Syzygies,, on my metal "comal".
Method 2 - As per Rick Bayless' second method, start with a pair of tortillas, heat one side on the comal, turn over, stack another tortialla on top, turn over, repeat until you have a stack of about ten and one side of each tortilla has seen some heat.
Method 3 - Go full @PVPAUL and heat on open flame, two by two.
Method 2 won the comp. Method 1 restored some pliability to the tortillas but also a slightly unpleaseant dampness. Extra step of steaming also introduced more work so it quickly lost favour. Method 3 is speedy but risky on the fingers and, without the resting stage in a warmer, the tortillas were more brittle and liable to break if you made up a tortilla straight away.
As for the Rick Bayless v Diana Kennedy debate raised by @Syzygies? Thanks to recommendations from the forum I bought both books when I started my Mexican food journey. I have cooked recipes from both but I generally end up reaching for my two tacos books - Tacos: Recipes and Provocations and Breddos Tacos. The possibilities with tacos seem endless and these two books include interesting salsas and roasts, enough to keep me occupied until I die (eventually) or get fed up of tacos (unlikely).