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Welcome to the Forum!
Sorry about your grandpa.
Suggest starting afresh by taking as many cuttings as possible, as soon as possible, from your plant.
At a garden-supply store in England.
Found: One Incredibly Large Porcini Mushroom
Boletus edulis - Wikipedia
Looks like Solanum dulcamara.
Chickweed and speedwell (Veronica chamaedrys), perhaps.
May be Ailanthus.
One for you, Frog! :-)
Might be corking:
Natural corking on Cactus & Succulent plants – Desert Plants of Avalon
Veronica persica, maybe.