Well ... take this kindly - but if you carry on like this the likelihood is that your bees will swarm to the point where you have no bees left, let alone any to give away. Colonies don't just swarm once, when they get going there can be several caste swarms ... and each one depletes the colony.
Do you inspect for queen cells ? If you do - what do you do when you find them ?
You really need to read up on artificial swarms ... a good place to start is here in Wally Shaws booklet which is really the bible for beginners who find queen cells (and a great reminder for those of us with ageing grey cells as well).
https://wbka.com/wp-content/uploads/2021/12/wbka-booklet-english-PDF.pdf
It's not very responsible to allow swarms to emanate from your hives - they are going to find a home somewhere and that could be in a neighbours chimney or roof space and they then have the problem of removing them.
If you want more of a read then get a copy of the Haynes Manual of Beekeeping - it will lead you through the beekeeping year and allow you to pre-empt some of the things that may happen and what to do when they inevitably do ...
Thanks for this. To answer your question I have been pretty diligent with weekly inspections until I ran into some difficulty keeping up this spring. I do understand the undesirability of swarms to neighbours as I said in my OP. Of the swarms from my two hives up until today, I boxed one and gave it away; I followed one to a nearby nature park; I have another another in a nuc. Another lodged in a holly bush in my garden for over a week, resisted the swarm lure and has now succumbed to the unseasonal weather and fallen to the ground. Of course avoidance is the objective and the key to that I understand better now is the art of splitting (which I have done) and recombining (which I have not). A respondent in here said that I will likely need twice the amount of kit as you need hives - probably in the context of wanting only two hives - and that's helpful.
I had another cast (?) swarm today which has come to rest in a tall tree overhanging my garden so I will have a go at recovering that tomorrow. That makes primary plus two from that hive but there are surprisingly many bees left considering the size of the clusters outside. I have recovered one of this hive's previous swarms in a nuc and hope that will yield resources in the event that my two hives don't recover.
I tried to follow the instructions in the wbka information and found just one virgin queen to free. I destroyed other queen cells as instructed. My other hive which has also swarmed twice had no capped queen cells today, plenty of bees but no brood capped or otherwise.