Tesco have the following on a Buy One Get One Free offer:
Tesco Original Blend Roast & Ground Coffee, 227g - £1.39
Tesco French Roast & Ground Coffee, 227g - £1.82
Tesco Italian Roast & Ground Coffee, 227g - £1.69
Tesco Colombian Roast & Ground Coffee, 227g - £2.45
At 70p per pack, the original blend works out much cheaper than their value blend and I think it beats any of the competitors by around 30p.
For those who prefer brand names, they have Douwe Egberts Real Cafetiere Coffee, 250g and Douwe Egberts Real Filter Coffee, 250g both half price at £1.39.