Following approval of BSC CP P503 Unfreezing MDD to enable load diversity - Elexon BSC, new versions of Market Domain Data (MDD) have been published on the Elexon Portal on 04 December. This Urgent modification temporarily unfroze certain MDD entities in order to apply new Standard Settlement Configuration (SSC) and Time Pattern Regime (TPR) combinations. The REC Meter Configuration Tables and the Market Domain Data are presently within a Change Freeze Period until the closure of the MHHS Transition Period and therefore must remain aligned. On 10 December, the RECMEP, as the responsible committee for changes to the REC Meter Configuration Tables, approved a change to update the REC Meter Configuration Tables to align with the P503 changes made under MDD