England centre Billy Twelvetrees is relishing a clash with Wales' Jamie Roberts after declaring he is expecting the most physical battle he has faced in Sunday's crucial Six Nations encounter.

Roberts will spearhead Wales' assault at Twickenham in a side featuring two changes to the one that beat France 27-6 with Scarlets centre Jonathan Davies and lock Alun Wyn Jones coming into the side.

Twelvetrees has faced several of the game's most feared centres in Ma'a Nonu, Wesley Fofana and Brian O'Driscoll in a developing Test career spanning 11 caps.