I noticed Holly had that sequiny thing in her parting, and I've seen this with other dancers too, and being a dancer myself I'd love to know where to get them from? Any help would be appreciated

Bump

Spotted this a couple of times and would love to know how it is done too. One of the contestants mentioned her scalp was covered in glue from extensions etc so am guessing maybe a specialist glue?

False eyelash glue maybe?

There are something similar if you google iron hair crystals. They seem to be attached using straighteners there is also a hair extension called the blingstring with swarowski crystals
It has a little clip you put in. It's not quite how Holly had it but I suspect they glued crystals toher scalp.

Ah that's a good suggestion!