They have done a post mortem on the whale.
"A statement released on Wednesday by the CSIP said the whale - believed to have been about a year old - was judged to be in moderate-poor nutritional condition, with no evidence of recent feeding.
Relatively minor parasitic infestations were noted within the vasculature of the kidneys and also within the stomachs and intestinal tract and in the blubber.
There was no evidence of marine debris/plastic ingestion in the whale's stomach.
The findings from the gross examination are currently considered to be consistent with live stranding of a "nutritionally compromised and out of habitat individual".
""This is the third fin whale to be reported in the UK this year - over the last five-year period 17 fin whales have been reported stranded in the UK."
Such a shame as this whale had beached 3 times and was believed to be only 1 year old, and can normally live to 100+.
https://www.wirralglobe.co.uk/news/18523473.post-mortem-death-whale-became-stranded-dee-estuary/