voy1d: Yup, waiting for someone at Vodafone to answer the phone because there has to be something bigger at play.
They were done over wifi (I don't own a network cable) and when everything was fine (prior to 6pm) I had good speeds.
In that case, you need to get an app or program that will show you how many other wifi APs are around, what channels they're on and what strength they're at. But unless you're out in the middle of nowhere with no one else around, you need to test with wired ethernet. (Your wifi could be getting congested because everyone else is on their wifi at the same time)
(Unless you're on 5ghz 802.11n/ac and no one else is)