You need a switch for the wired connections, and an access point for the wireless connections. Or a device that can do both.
Forget the bridge bit, not relevant in this case. That's about joining multiple networks.
Given you have a spare router, configure it as an access point, and test to (a) confirm it acts as a switch (b) see if wireless handoff is really an issue.
That’s great, thank you! So it will be a case of connecting it to the main router via the wan port and set up the wifi (possibly with the same id/pswrd as the main?) as I normally would?
You need a switch for the wired connections, and an access point for the wireless connections. Or a device that can do both.
Forget the bridge bit, not relevant in this case. That's about joining multiple networks.
Given you have a spare router, configure it as an access point, and test to (a) confirm it acts as a switch (b) see if wireless handoff is really an issue.
Then worry about whether you need new kit.