Normal price for these is £30, a quick search online seems to support that so £20 isn't bad for them.
Can only confirm the on-line deal, there was no stock in Perth when I went in to look for them. Small and Large only.
The blurb -
The E-Tip Gloves are form fitting, four-way stretch gloves that offers warmth with the added bonus of working any touch screen device with your gloves still on!
Comfortably work your phone, MP3 player, or laptop mouse pad with warm hands. Four-way stretch
Silicone grip pattern on palm
FABRIC shell: stretch knit /Xstatic fingercaps