Well done you.....£70 may sound like a lot, but if it gets you a baby then its worth every penny!
I've used mine TTC twice now...and will again in a couple of months if I haven't gotten my BFP by then. Mind you, the one thing you will find out is that it really helps you learn your cycle too, so you may not even need it to know your peaks before too long....but still well worth every penny.
Just a heads up. Do exactly as the monitor say for the first month. It needs to know your levels exactly. Don't be disheartened if the first month you see several highs, and possibly no peak...it doens't mean you haven't ov'd it just means your bodies levels we slightl different than the pre-programmed ones it comes with. You will have Ov'd in those highs somewhere....so

like mad!
After that it is a bit smarter...it is then working off YOUR levels...as it got to know them the previous month...clever huh?
Now here the money saving bit. Once it has determined your surge, the monitor then gives you 2 days of peak, followed by one of high and back to low again....always. Cos thats what happens after a surge, to everyone....3 fertile days. So from the second month onwards, you could dip the test strip in orange juice once its detected your first peak and it would still tell you a second peak, a hgh and low. Sooooo, to save sticks, re-use the same stick from the first peak, until it says no more. That way I generally only need 5 sticks a month....6 tops.
Genius huh? And am here if you have any questions....cos I know this little beastie pretty darn well by now!