AFM I think that monitor actually did do the right thing with my 'peak' after all because I got (cough) a lot of ewcm tonight. Hopefully I will O tomorrow if I haven't already today. I am going to test with the normal opks tomorrow and see if I get a solid smiley.
@jussi, thanks for the tip. I have been using FF just not for temping. So that's a natural progression. If I don't get utd this cycle I'll try it for the next. The bbt is sitting in the cupboard ready to go