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I have done that, and exactly as predicted it says my LAN connection speed is 100Mbps. Thank you.
However, I am now confused. They had visited to sort out my slow Broadband connection, and in the bizarroland that BT inhabit, the engineers are not allowed to touch my computer, yet they couldn't test my connection speed themselves as their laptops are "away being updated". So I called up a website to test my Broadband Speed and they were both amazed that I had to do that, they both claimed they use the icon, which they described as exactly like the one you have helped me to set up. One of them gleefully told he how me gets 7.5Mb (not what someone who gets 300k on a good day and has been arguing with BT for 8 months about wants to hear. ) But of course they told me that the internet test was unreliable (they would, wouldn't they)
Thank you for your help anyway.