damage to spokes and rims can be just your bad luck for example hitting a kerb or a large pothole. Check all the other spokes, if some of them are loose, then you can use that to argue that the wheels were not properly prepared. If you are not experienced with bike maintenance, ask a friendly bike shop for their advice. All bikes need a bit of TLC.I take your advice on board. However there was no audible buzzing, I hadn't used the bike that much before this trip, and I had checked it over before setting off.
https://www.thoughtco.com/bike-spoke-maintenance-365490