Not pissing money down the drain and avoiding the heartache of BFNs is exactly what I hoping for Bertie, and the book is so enlightening. I got it for about £8 off amazon. My brain was scrambled (with masses of info, not confusion!) and racing by the time I'd finished reading last night but it's so easy to read, and actually quite funny, I was completely hooked. She has a website as well. I haven't been on it but I'll find you a link if you haven't seen it.
And you're soooo right on Ovia vs FF. Ovia asks for a lot of info and then dishes out the same generic crap every day. It's been useful as a record of symptoms, but I could have made a note anywhere. Do you pay for it for the bells and whistles? I'm a bit tempted but not sure how long I'd sign up for and it is expensive.
NoCats, if you take it the sameish time every day I don't think it matters, you'd still see changes. She suggests doing it as you walk to the bathroom if you're desperate for a wee, and ways around working nights and things.
DH knows I'm temping and isn't worried about knowing where I am in the cycle, but he hasn't noticed me actually doing it at all. I bought the £16 digi one on amazon and the beep is barely perceptible. When I'm half asleep I have to struggle to hear it. I keep it on my bedside table, wake up, pop it in, take it out and then doze or get up.
I've had two horrendous nights sleep, last night I was awake for an hour and a half from 4:30, the night before I was awake every hour for about 10 minutes from 4. Bad sleep doesn't do much for temp consistency! But it's still useful.
I had no idea that 18 consistently high temps after ov mean you're pregnant. That's what she says and it would certainly save money peeing on sticks!
I'll stop banging on about it now, sorry, I have the zeal of a convert 
What it doesn't answer is why the fuck I'm not pregnant when we tend to DTD every day or at least every other day and have never missed ovulation. But at least I'm getting more of an insight into my cycle, just from a nerdy knowledge perspective. She suggests every other day works for some people but only if your partner has a proven sperm issue.
Beautiful chart grumpy, god I hope this works for you xxxx
Crossing everything!