They definietly aren't fossil seeds/pods, but I'm not sure what they are (they could be fossils, but I think they could be flint.)
Fossils seeds are more symmetrical shaped.
Here is a picture of a trigonocarpus nut which I found.
I concur with the others: these are pieces of flint/chert, probably rounded to start with and made more-so by erosion on a shingle beach. I don't see any distinct fossils, but some could be burrow-fillings.
and if your find/have some flints with bands in them:
I will post more detailed photos of a few, which have very seed-like markings, in my opinion (for what it is worth). I have managed to track a few of the ??? via Google images. The link below is an example of one that I have, however it is listed as un-identified:
I have also seen others, which are very similar and they have been split open and small fern leaves are inside. This gave me the idea of opening one of the ??? to see what, if anything, was inside. I hit one of them with a hammer and managed to split it open. Pictures to follow.
Pictures 1, 2 and 3 are one fossil, which is shaped like a sycamore type helicopter seed
Pictures 4, 5 and 6 are also one fossil?? It looks like it has two seeds still inside 7, 8 and 9 look like seeds that have hung in a bunch, maybe like an, upside-down, hand of bananas would 10 has markings that are very nut like 11, 12, 13, 14 look like the images that I have seen cut open 15, 16 and 17 look similar to pic 4,5 and 6 except they have no seed inside, alternatively, they look like pea pods with peas still inside 18, 19, and 20 look like a nut with a bit of its shell missing, exposing the nut fruit 21 looks like a smooth monkey nut 22 and 23 are similar to 21 24 and 25 are the ??? that I hit with a hammer 26 and 27 is also one I have opened
Your third and fourth specimens from the botton look to me to be bone! and some of your other fossils obviously have signs of ancient life but I have not collected in the area were your grandad found his fossils so I don't have a positive I.D,
Hope this helps.
Good photos; makes all the difference.
Now we see rounding (as before), but at the same time as prervation of what seem to be original surace details.
That, plus the overall shapes (and to some extent their variability), plus the cross sections looking distinctly un-flintlike, makes me think they are coprolites. The vaguely fossilish objects within and at the surface would then be plant/animal remains.
However, I'm not sure what to make of the white band/volume in the broken specimen near the end.