Hi Clouty973,
Thank you for using Apple Support Communities. I understand you are having issues with your MacBook connecting to the internet. I'd be happy to help.
Before we continue further do you have a backup? If not that's alright. It's always recommended to have a backup before troubleshooting potential issues. If you'd like to make a backup here is a great resource: Back up your Mac with Time Machine
After you have created a backup I would recommend taking a look at this resource related to internet connection issues: Solve internet connection problems on Mac
In addition, I'd also recommend taking a look utilizing a new network location on your Mac to further troubleshoot your settings: How to use network locations on your Mac
Enjoy your day.