I would suggest that you change the working IP range of one of the routers - probably yours would be the easier.
I think the two systems are using the same range so your network is "discovering" the device as it's whithin the IP range for it's segment.
If you are using DHCP simply go into the router and change the settings from 192.168.001.001 to 255 to something like 192.168.010 001 to 255.
You should find that once you reboot all your devices the issue will be gone
Thanks Barman58 - it seemed like a logical thing to try!
I changed MY router's local IP Address from 192.168.0.1 to 192.168.10.1 and rebooted the router. Then I changed the static address on my laptop from 192.168.0.x to 192.168.10.x - and rebooted.
Unfortunately, the undesired router continues to be displayed as Infrastructure (1) on my network.
Sorry that I appear to have missed your reply here

The only thing I can think of that would cause the other router to be appearing in the your subnet is that the subnet is incorrectly defined (255.255.0.0 rather than 255.255.255.0) the only other thing I can suggest is if you try one of the other Private address ranges
This wikipedia page will give you the listings of those available for private networks ....
Private network - Wikipedia, the free encyclopedia
My Computers
System One System Two
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Laptop - Quad 8GB - Windows 10 Pro x64
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10.2" tablet
Sony Z3 Android Smartphone
Wacom Intuos Pro Medium Pen Pad
Wacom Intuos Pro Small Pen Pad
Wacom Expresskeys Remote
Loopdeck+ Graphics Controller
Shuttle Pro v2 Control Pad
10TB NAS
.