If its stems are getting longer it may be getting etiolated (though the rosette on top still looks pretty tight) and needs more sun. If it doesn't have a lot of sun now, you'll want to acclimate it to more to prevent sunburn.

Some types of succulents do just have long stems on occasion, e.g. Google image "Ghost succulent".

I have the succulents on my window sill facing the north-east 24/7 could this perhaps be a bad spot? I have had problems with other succulents in the past that would lean over to get more sunlight

The leaves probably won't get any bigger (If they do it won't be by much since there's a genetic limitation on how big they can get). I personally prefer the smaller ones since I can squeeze more of them into my tiny grow space :)

That is really huge pot for such small plants. I don't know what you have them potted in, but too much of mix - if it doesn't drain really fast - could create a problem sooner or later. And plants seem to be lost in all that extra space.

If your plants lean, that is definite sign of insufficient light and should be corrected. Otherwise, they will grow weak and spindly looking, and probably not as well colored as they should be. Even plants that trail or grow longer stems naturally should have sturdy stems.

I second Rina's comment: the pot is too big for the size plant. Rotating the pot a 1/4 turn every time you water can help keep the plant straight.