Next Monday, Shirley Carter drinks herself to oblivion at the Queen Vic and takes up an invitation to Derek's for a nightcap.
Speaking to Inside Soap, Foreman revealed that Shirley initially fears she has slept with the villain before he spreads the word to Phil.
Foreman divulged: "Things aren't as they seem - they haven't given Derek a woman just yet.
"Derek doesn't sleep with Shirley (Linda Henry), he just sees it as the perfect opportunity to wind Phil up. He doesn't care what he does to get a reaction or find a weakness in Phil (Steve McFadden).
"Derek isn't afraid of reprisals - he's the kind of man who will always live to fight another day."
> EastEnders casts Derek Branning's daughter Alice
> EastEnders Jamie Foreman: 'Derek will surprise viewers'