Angelcare Baby Monitor, with sensor pad to monitor Baby's movements.
Gets rave reviews on almost every site.
Been looking for one at a decent price for a while, cheapest I've ever seen is on Amazon for £79. So to see it at Half that price in Tesco I nearly ran out the shop with out paying.
There was only one on the shelf in Wigan, (hopefully nationwide) but the Shelf edge label confirmed £39.97 and I've uploaded a photo of my receipt.