I appreciate the constructive criticism and advice from the vast majority of people on this forum. I was a bit reluctant to post this thread because I knew there would likely be the odd person who would just want to 'have a go' at me. Ultimately, I'm keen to learn and hopefully prevent this happening again which is why I decided to post the thread regardless.
This is my first year keeping bees. I joined my local BKA and attended their beginners course in Spring which was on Zoom due to covid. I was able to attend a few 'hands on' days as well which covered the basics. There were a lot of beginners at the club in the same boat as me so 'mentorship' was in high demand, as were bees. Lots of the experienced beekeepers had lost colonies over the winter so were unable to provide colonies for the beginners. Most of the bee suppliers had ran out of nucs to sell too. So I had a go with swarm traps, not really expecting much if any success.
As mentioned, the swarms all came at once which was a real surprise and I did my best to accommodate them. I ordered some new equipment (I only had one hive and some homemade nucs) but it was a struggle to get hold of foundation as the suppliers seemed to have a run on. I fed as needed and inspected them regularly up until mid August, at which point I ended up having to leave them in the care of a friend until November. I continued to monitor them as best I could through my friend (also a beginner) and they were given plenty syrup in October and then fondant in December.
I don't think I neglected the bees but I'm sure there are things I could have done better or differently, which is why I decided to ask for advice on here. I certainly did my best with the knowledge I had. Of course, ideally I wouldn't have left them in the care of somebody else during the autumn, but life happened and I adapted as best I could. Had I been here, I was intending to combine at least two of the colonies.
It's sad that the colonies perished and of course I feel responsible. Hopefully they didn't fare any worse than they would have if they'd chosen a tree trunk (or chimney) instead of my swarm traps.