Merge points are slated to replace holding for many routings in the London TMA. Keeps traffic higher - more fuel efficient sequencing.
LCY benefitted from relatively direct routings before - LTN for example has suffered from a long slog from the south and west over LHR and out to Cambridgeshire for many years now except off peak, when the much shorter routing from Brookman's Park or the west can still be used.