Bone marrow Bolognese is nicked from Rosie Ramsden's recipe which in turn draws from the Italian use of marrow.
The sardine stock is nicked from a chef who uses it as a base for a fish soup.
The cornflakes ice cream is a poorly repurposed copy of Cristina Tosi's and the idea has been done to fucking death. The fried chicken with corn and Banana is Chicken Maryland. Crab rarebit and fish finger tacos are heavily inspired by Nigella and have also been heavily done to death, the celeriac colcannon too. I could go on.
She's well known for nicking ideas. And Marina O'Loughlin is a gullible idiot.