Hello swtigeruk,
After reviewing your post, it sounds like the MacBook Pro is having trouble connecting to different Wi-Fi networks. Is the MacBook Pro able to connect to any Wi-Fi networks? Not being able to connect can be caused by wireless interference and you say there are multiple devices. There are a couple things you can try that may be able to help. I would recommend you read these articles and use them to help troubleshoot the issue.
Resolve Wi-Fi and Bluetooth issues caused by wireless interference
To start up in safe mode:
- Start or restart your Mac, then immediately press and hold the Shift key. The Apple logo appears on your display. If you don't see the Apple logo, learn what to do.
- Release the Shift key when you see the login window. If your startup disk is encrypted with FileVault, you might be asked to log in twice: once to unlock the startup disk, and again to log in to the Finder.
To leave safe mode, restart your Mac without pressing any keys during startup.

If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys.
- If the issue comes back, you might have incompatible login items.
- If the issue doesn't come back, it was probably caused by a cache or directory issue with your startup disk, which safe mode fixed."
Use safe mode to isolate issues with your Mac
Please don't hesitate to let us know if the steps resolved your issue or if you need additional assistance.
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