Clip On Hair Pieces

Looking for clip in hair pieces, those on a butterfly clip that you clip to the back of your hair to add a ponytail etc.
Do not really want to buy online as its difficult to match the color of hair. You do not know where to look to London, any ideas? Thank you

Selfridge sell clip on ponytails called Hothair.

Or try Harvey Nichols Dept. Store

View Website Hothair and go to retail outlets.

Claire's Accessories or accessories is a good place to buy wigs