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#11
You are looking at your adapter Noise and RSSI. Also looking for any Access Points that may be close enough to you to cause signal issues. With you being in the UK, you have some other channels to choose from. There are some info that I came across after I updated the Firmware on my Access Point I use. It was stating that we should now be using channel 3 instead of 1, 6, 11. The Channel Bandwidth can be an issue if you cannot set it to 40mhz, because you have older equipment that still needs Wireless B or G on the legacy 20mhz channel bandwidth.