Thanks again. The TP Link adaptor works great.Converts your USB port into an Ethernet port; Gigabit Ethernet connection; Windows & Mac compatiblewww.currys.co.uk
This one works with my a80J
I had the 'Cable Matters' adaptor for less than two weeks and last week I was still getting between 420 and 451Mbps.
Since the software updates to the SONY TV on Saturday, the 'Cable Matters' adaptor now consistently yields a result between 107 and 121Mbps in a speed test. This is despite the router indicating that it has negotiated a link speed of 1Gbps.
The TP-Link adaptor works fine and I'm now getting a speed test result of 455Mbps.