Here are the results of the swiss jourey (yes, like the Eurovision Song Contest).
I watched the cones I placed in the glaze firing through the spy hole and saw them go over at 1250 degrees. The following firing went at 1240 degrees but the glazes look very unusual indeed! Last night I whacked the kiln on (with cones to see what really happened) to fire the 1250 and went to bed. I've had enough stressing over kilns. So will find out very late tonight if it's worked.
Although I turned the kiln off at 1250 I think all that over firing had damaged the elements so much one actually melted! I presume it arched because the coils were lying so flat and the concentrated current made it into a puddle.
I spent the weekend repairing the element and it is firing again but still not correctly. Time to phone pottery crafts!