Actually I know what it is - I did plant it but I wonder if others do. It is not a blackberry and you can eat it.
IMG_0108_Mysteryberry by davholla2002, on Flickr
I think Phalangium opilio
IMG_0113_Harvestman by davholla2002, on Flickr
female Myathropa florea (batman hoverfly). TQ 40100 68716 01/07/2022
IMG_0096_batman_Hoverfly by davholla2002, on Flickr
Female Crab spider Misumena vatia
IMG_0128_Crab_Spider by davholla2002, on Flickr
Bumblebee
IMG_0120_Bumblebee by davholla2002, on Flickr
IMG_0108_Mysteryberry by davholla2002, on Flickr
I think Phalangium opilio
IMG_0113_Harvestman by davholla2002, on Flickr
female Myathropa florea (batman hoverfly). TQ 40100 68716 01/07/2022
IMG_0096_batman_Hoverfly by davholla2002, on Flickr
Female Crab spider Misumena vatia
IMG_0128_Crab_Spider by davholla2002, on Flickr
Bumblebee
IMG_0120_Bumblebee by davholla2002, on Flickr