I wouldn't give up hope just yet, wait another 2-3 weeks to see if new shoots come through. I'm in the South west too, and my potted evergreen agapanthus stay outside all through the winter as the pots are too big to move. They are looking pretty sick at the moment but still have some green leaves left. I didn't even bother to bubble wrap the pots either like I usually do. They are on a south facing terrace next to the house wall.
Hope yours do survive, that's a pretty impressive clump and I love the hedgehog photobombing.
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Hope yours do survive, that's a pretty impressive clump and I love the hedgehog photobombing.