2x hot packs for just £3.90 at Firebox.com with standard delivery.
Works out cheaper to use the -£5 voucher "FHM14" at the checkout than the free delivery code as product value is greater. Voucher also takes 5p off postage in this instance.
Handy for the current weather or for a nice gift I thought!
15% Quidco can bring this down to £3.75