Loose switch Nicky Clarke hairdryer?

I doubt you will be able to find a replacement part without speaking to the manufacturer's department.
Depending on what you mean by 'wobbly', you could try fixing the switch yourself...
If the switch is working, but the whole switch body has come loose, try opening up the dryer and securing the switch with Araldite glue. If the actual switch mechanism is faulty, try taking it out and see if you can split it apart and see if the rocker spring has become dislodged.

Rupert
January 2020