And here is a pic of the lower leaves, you can see the difference.

Does this plant receive sufficient sunlight?

Check closely for insects as well.

Needs more light

Hi & welcome to Gardenweb! That was my thinking too, more light, especially seeing that you're in England. Probably not much sun there lately. When variegation fades, in general on any plant, it's almost always a sign of insufficient light.

I've not had this regular-size Scheff but on the mini one, S. arbicola, new leaves come in at an angle like that, and become more flat/upright as they mature. When I loaded up a google search, I saw many pics of the same thing on the newest leaves. Do the more experienced people with this plant agree?