Now showing on INSSIDER a second feature

[#1]

My TG585 v7 is set up to find channels automatically, usually channel 1. INSSIDER up to now has not shown any other users sharing a channel with me.
Now there is one ( see attachment). Is it indeed something to do with Broadcom? The file name would suggest it might be.
Why has it suddenly appeared?
My reported RSSI has dropped a bit too, and has made me try to work out how to change the channel, but I cannot see how.
I await advice, instructions etc etc. Please!

[#2]

From the manual I have
Change the wireless channel
Proceed as follows:
1 Browse to the Thomson Gateway Web Interface.
2 On the left menu, click Home Network.
3 Under Wireless, click your access point.
4 The Wireless Access Point page appears.
5 In the Navigation Bar, click Configure.
6 Under Configuration, select the channel of your choice in the Channel Selection list.
7 Click Apply.

[#3]

It may be worth changing channels in this instance because the other network is an old 802.11b (11Mbit) network.

[#4]

Ta much! Now to bath and bed as need to be up 3am for trip to Gatwick