Brought it along to the midwife, and she had a quick go, without any luck... she showed us with her own device, and we did get to hear the heartbeat, so it should be possible for us to pick it up at home. As suggested, we were too high up, and not pressing hard enough.
The midwife suggested that it might be easier with less hair, which I thought sounded like a great idea, but apparently not so ;\)
[Modified by: anondaddytobe on August 06, 2008 06:05 PM]