Thanks Blacksheep, but as far as I am aware, only one ignition is required when anti-ice is switched on, and only remains on for a short while, if their is only little turbulence.. .. .I sort of thought that there must be some sort of electrical commonality in the operation of the two systems, and the a/i check just proves that the problem is with the igniter plug giving up, rather than the common control system.. .Sounds reasonable, but can't find anything in writing, and the groundies can't tell me.. .I got this info from an FE, that's why it sounds reasonable!. .Any more ideas?