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Hern proved them wrong, pioneering new approaches to make later abortions safer, including dilating cervixes with Japanese seaweed tubes called laminaria.

But MBL co-founder David Mackie insisted its plans to harvest the seaweed - laminaria hyperborea - are "entirely sustainable".

I won’t put in an extra set of laminaria, or add an extra day, that’s going to add significant cost of expense to everybody.

Vegetable gelatin is manufactured from a seaweed, genus Laminaria; from the tengusa, an American seaweed, and from Irish moss.

The Laminaria is first extracted with water, and the residue with sodium carbonate; the filtrate is acidified with hydrochloric acid and the precipitated alginic acid washed and bleached.