A lot depends on the specification of the wifi receivers and their antenna gain. If they can connect at 5Ghz using the wireless 'ac' standard you have the best chance of getting the fastest speeds the hub can supply. The original PS4 is only wireless 'n' and 2.4GHz, for example. One option might be to use powerline adapters for any devices that can't connect at 5GHz. Although, if you're streaming sky go I would think 20-30Mb would be fast enough since they use adaptive streaming, and I think it's only 720p at best (I think). Wifi repeaters might also help.
If you're getting less than 50Mbps 6ft away then the limiting factor will probably be that particular devices hardware or how it's connected to the hub. You could try changing the wifi channels on the hub in case you're getting a ton of interference from a neighbour, although the hub's supposed to pick the best option. WiFi Analyzer is a good app (pc or phone) to see what frequencies are the busiest. Rotating the hub slightly might also improve the signal in some locations (I got a few extra dB upstairs).
