Went to my local Lidl in Walthamstow and saw these cute heart shaped hand warmed for only £1 for 2 in a pack... looked around and they seem to be going for roughly £4s on websites.
* Heat when you need it at a click of a button, 54(c)
* Simply Click the metal disc and a chain reaction takes place producing heat!
* Excellent for Muscular Pain, Outdoor Activities, Aches and pains, poor circulation and Sports Injuries
* Simply Boil for 5mins in pan of water until the crystals melt and then it's ready for when you need it again
* Reusable 1000's of times.