Can anyone tell me which microphone pick up which installs onto a flute are used by amateurs for recording?

I'd like something which can be put on or taken off but I don't know much about mic recording.

You may use a earset, as the name indicates, you put it over your two ears, like glasses, and the mic goes upfront at a side to your headjoint.

You also may use the kind used by lecturers that goes on their suits. Just take the clip away and fix the mic in your headjoint with transparent tape. The best position is at the right side of the embouchure hole, to avoid the noise of the airstream.

Thanks - that sounds ideal.

Any leads on which brands to look for?

Oh, yes, indeed. Mine is AKG. I just love it!
I'm sure there are many excelent brands out there, but I can only tell about this one I use, so... :-)