Deps of PBS applicants are supposed to get a reduced fee if they apply at the same time as the primary. All well and good, everybody knows that part already...
But the fee schedule on the UKBA site is *WRONG*. And worse, they are charging the wrong amount. They expect to fix this over the next few weeks before all the changes for June get mounted. But the changes for June will not get mounted until after Parliament rises.
So in the meantime, don't be a jerk and pay more than you are supposed to.
NOTE: this only affects the PBS side. The family side like FLR(M) and so forth is not affected.