Report back: I sent my personal shopper (er, DH) on a pancake-finding mission (hoped it wouldn't be a wild duck chase....sorry....) and he found them in the takeaway section of the St Albans Waitrose. Horray! Roll on duck pancakes tomorrow! (leftover duck from Christmas day, mmm. Has been in the freezer - isn't two week old duck!)
Ooh, thank you very much everyone. Although I am a perfectly fine cook, I'm not sure I could get them thin enough if I roll them out myself. Hm, will see if we have a Chinese / Asian supermarket anywhere. Or ring the local Waitrose to see if they are going to start stocking them again any time soon.
I'm after those lovely thin pancakes you get in Chinese restaurants with Peking duck - where can you buy them? I have tried the local Asda and Sainsburys. Waitrose maybe? Or do I need a Chinese specialist shop?