Overall, UW12 functionals allow increased accuracy compared to standard hybrid func-tionals in a similar manner to double hybrids, but without using the virtual orbitals. In addition, the fully self-consistent nature of UW12 avoids a number of the problems associated with double hybrid functionals. The ability to capture correlation effects neglected by standard DFT functionals using only the occupied orbitals and a simple geminal function is both useful and theoretically interesting.