Thanks to those of you that responded to my request for help, I’m ready to declare some findings! I would state right now, I’m sure this is far from a totally fair test. I would have to travel round the UK, placing each providers SIM into my phone and testing them all in the exact same location, same conditions and at the same time for it to be totally fair. This isn’t possible though, so hopefully I have enough results to make some decent conclusions.
I will keep adding to the maps, so please continue to submit your results, hopefully we can help others looking for information on network speeds. Lets get on with the results.