Thank you for the reply Marcos and Foneil.
So basically a previous single multi-device EIS license was £40 and a 5 user license being £59.99 that I could use with Linux is now with ESET Protect Entry a minimum of 5 licenses for £169.80 and if I want a gui(Cloud Console) then it is £212. If I understand correctly. So a 430% price increase, in the year of Linux too :p
(£40x430%=£212. I know some of that is VAT but not being VAT registered I have to pay).
An option of buying less licenses would leave a more viable option for home users. I presume there are so few home Linux users it's not worth ESET's time.