Bad news about your sheep. I've just had a look at your pics and judging by the types of plants, it looks like this area has been part of an ornamental garden or perhaps an area where garden debris has been dumped.
The first two pics look like Polygonum (Bistort) and if left to grow would produce spikes of pale pink flowers.
The third pic looks like a type of Astrantia, which has a loose head of pink to white flowers.
The last I would say is Kniphofia (Red Hot Poker) you can seen the old flower stem still attached.
They are all garden plants that were once very common.