@Alan+Pearce upload speed is not guaranteed by Sky or Openreach but should be roughly 40% of the download speed. If you have a black Sky hub post the hub's connection stats as they should show what is going on see Sky Hub statistics
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
