Well, I think it looks like one!!
It’s about 150ft off the shore of Wastwater in the lakes.
Saw the topic and immediately thought “How did he get permission to fly there?”
MY Whale Island:
If you look at the Wiki post the island was once whale shaped like yours but it has been enlarged by reclaiming land over the last 100+ years
Being Ex Navy and having been based there for a short while, that was my first thought to Rob.