Thanks Tom,

The next paragraph explains how they 'helped' me out:

Typically at Heathrow there is an airplane flying just 3 miles behind you when you touchdown. This means flights are required to spend a minimum amount of time on the runway. That night however, the tower informed us that there was no one behind and we could plan on rolling to whatever turnoff we'd prefer. I touched down in the normal target a thousand feet down the runway and then instead of using a significant amount of brakes and reverse thrust, elected to roll to a slow stop using two thirds of the two mile long runway.