on 28-04-2020 04:35
on 28-04-2020 07:35
It's area/mast dependent. If many people are using 4G+ then it will be slower.
Also they could be upgrading a mast near you or doing maintenance work so it will only be intermittent. Check it out here https://status.o2.co.uk/
Personally when 4G+ flashes up in my area, I see no difference in speed at all.
Veritas Numquam Perit