Derek gave an interview for the sun. Apparently he thinks Craig is really is starting to show signs of being really unstable now, and that Anthony is really a closet gay. He reckons that just because Anthony never "got it on" with Sam, he must be gay

Did it ever occur to him that he might not fancy Sam. Derek must think that if a lad is straight, they have to be flirting with women all the time

I suppose some men out there like to flirt with women all the time, but there are also lads who don't bother with the lap dog thing/routine.