Wow, the English green hock could almost be the [fraternal] twin to my glass. Amazing, thanks.
In relation to uranium glass I think the problem here is the usual problem, a lack of documented examples of a specific date. No shortage of other colors being produced in this and earlier periods blues,amethyst, green, etc. Certainly, it was not a simple endeaver in the 1840's as it probably became in the 1880's. As to where is this uranium glass of the 1840's from Holyrood, Pellatt. I would think that some examples do exist. Maybe un-attributed, mis-attributed as to where and when. My understanding of Bohemian glass generally is that it was based mostly/not always on a non lead glass formula. whether this applies to their uranium glass I do not know.
The links to Heisey's marigold do seem to be down as is the site generally. Possibly maintenance. Worth a try later. Heisey did have a workable formula for uranium glass prior to 1929. Marigold is an attempt at a different shade. A bit orange shade in my opinion. Supposedly as the flower, thus the name.