I think the 0.6m is just a general requirement that no fittings be within that distance of any part of the shower cubicle.
If the shower opened toward the left here, that switch would have to be much farther away under the general rule that it must not be able to be touched by anyone in a bath or shower. The distance specified for that is 2m (about 6' 6").
The twin socket would be allowed only if this were a shower cubicle in, say, a bedroom. In a bathroom, the only socket outlet allowed is a xfmr-isolated low-power one for an electric shaver.