Looking in detail, your dno will change the fuse, your supplier is responsible for upgrading the tails.
Bulb are accepting responsibility and will get on with it. British Gas, by contrast, put the whole process on the dno. https://www.britishgas.co.uk/energy/charge-point-dno-process.html
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark