He found a willing ally in Mahmood and, other than a miscued hook on 65 which almost gave Plunkett a return catch, he progressed without much trouble to his second century of the summer.
Jaffer took two more boundaries off Sidebottom to move to 22 before skying an attempted hook against Tremlett to gully, where Kevin Pietersen claimed the catch.
Imrul Kayes again paid the price for his fondness for the hook shot against Finn and, as in the first innings, picked out Ajmal Shazad, who took the catch at deep square leg.