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hugo7-
https://www.lenovo.com/gb/en/p/accessories-and-software/monitors/home/66eduac1uk?
This looks alright but I guess it might not work with Mac based on the above
frankenbike
This one is £60 over budget but should do what you want: Dell s2722dc
We have an S2722DZ at home that works fine with a MacBook doing DisplayPort, power delivery and USB (that model has a built in webcam) over a single USB-C. That model doesn't seem to be available, but the linked one should work the same without the webcam.