I'm happy with Decca Ovation for Europe and have already entered one similar. If these releases appear in the USA as London then we hope one day to have a linked London release
This came up again as a random release, and I still think it needs to be made International - Decca's classical catalogues of the 1980's and 1990's made the point that it was an International catalogue, though not all releases were available in every country (Deutsche Grammophon's and Philips' catalogues said the same).
Also, another thing to consider as far as Decca Ovation is concerned, is whether to include Ovation as part of the label name. It doesn't appear on the actual discs, and there's the added complication of the US and Canadian equivalents then being on London (because the Decca name was owned by MCA Records) and the series name was changed to Jubilee because there was already an unrelated Ovation label in the US. If we want to have only one entry for releases with the same barcode, then I think we should leave the label name as Decca, with London to be added as second label for the North American releases, with Ovation and Jubilee to be mentioned in the notes. I have used this principle for a DG Privilege release that I have just added, because the series name was variously Privilege, Panorama Classique or Resonance depending on territory.