Thank you, Paul. The pics of the design representations answer all my queries regarding this Sowerby bundle RDs 339498-502 of 12 September 1879 - Parcel 13 and their corresponding Sowerby pattern numbers.
So:
RD 339498 is butter dish and cover pattern 1430 (see previous pics). The strange sort of 'X' crossed [twig] handle on the cover are the definitive clue.
RD 339499 is sugar pattern 1430 (see previous pics). Main clues are the shape of the bowl PLUS the baluster-shaped pedestal. Odd, though, that the butter and sugar are registered separately, yet the main point of similarity in the actual pieces is the distinctive decorative pattern on the sides of the 'bowls'.
This still begs the question as to whether the 'twig-handled' creamer pattern 1430 is covered by the same design as the sugar rather than the butter and cover, but who will ever know for sure now?
RD 339500 is sugar and cover pattern 1429 (shown on page 7 of pattern book XI, 1885) - see attached image from the pattern book. Simon Cottle collates THIS RD with butter dish and cover pattern 1430, but he is clearly in error. I don't have a photo of an actual piece of glassware from the pattern and would be extremely grateful if someone could show one here, please.
RD 339501 is celery pattern 1428 (shown on page 45 of pattern book XI, 1885) - see attached image from the pattern book and a photo of an actual example in clear glass.
RD 339502 is jelly dish pattern 1458 (shown on page 39 of pattern book XI, 1885) - see attached image from the pattern book. Again, I don't have a photo of an actual piece of glassware from the pattern and would be extremely grateful if someone could show one here, please.
Fred.