Jogort I suspect it’ll all be through BT infrastructure. I have Zen internet at the same speed and it’s been mostly rock solid. Only issues had (which have been very few) have been mostly maintenance issues caused by BT.
It’s made a huge difference in the house though. Rachel’s hugely aggressive remote work software and zoom calling was making it pretty miserable during the day and I’d have to reboot the router regularly.
Now, we can accommodate anything really. My remote MA and her work and Lily’s online stuff with friends plus whatever downloads we need.
You will probably need a decent router depending on what EE provide. We upgraded to a fairly pricey ASUS one which has been rock solid for about a year, which is unheard of in this house.