OK, this is a bit of a long winded one, but I do have it working now.
I had to change the recovery from Lineage to a custom TWRP which can be found here
After this, I use my windows PC to copy and paste the file using file manager in to the download folder on my phone, NOT SIDELOAD as this doesn’t work.
One this is on the phone, use TWRP to flash the e.foundation image.
After this, I got to the boot screen with the “E” and bouncing “.” however it was stuck, from here, I attempted to boot into the e-foundation recovery on partition B and then run a sideload update using the same e.foundation image. Results were the same.
After this I booted into the efoundation recovery again and performed a “Factory Reset” after rebooting, I successfully loaded into the efoundation OS.
Hopefully this will help anyone else having this issue.
I am using the 7T Pro McLaren.