@chrisjonkers - there's not much to go on here but I wondered if any of it looked familiar ? - it's intriguing me. It was getting very dark so what I thought were distinctive juvenile leaves - hairy, reddish tips, crenulated edges - perhaps are not it's juvenile leaves at all but something else growing closely in the multi-stemmed regrowth. It was alone on a rocky north-facing hillside amongst mostly resprouting E.sieberi. No worries if this rings no bells - it's a very long shot given the little I have to go on! 🙏
Band of sea spurge along dune top, at least 50m long and 20m wide