Hi gswarbrick
As per tudor, sorry but you aren't guaranteed a next day - info here from the Terms & Conditions section on the /VM/homeworks page
'Next Day Priority Service: Priority for available next day appointments vs other cable customers if appointment is required, subject to appointment availability. You must call contact centre during contact centre opening hours to get next day availability'
I've copy pasted some additional info below regarding Homeworks from the same linked page above
How to get Virgin Media HomeWorks
Call 0800 064 3855 to add HomeWorks to your broadband package. You’ll pay £9.99 monthly on a rolling contract – for 40% off (knocking it down to £6 monthly), upgrade your broadband speed while you’re chatting with us. If the boss calls you back to the office (or for any reason), you can cancel your HomeWorks subscription with 30 days’ notice – or sooner for a small fee.
How do you get HomeWorks if you have Gadget Rescue or F-Secure Safe?
To upgrade to HomeWorks please sign in on My Virgin Media account will be updated.