Sorry to hear that Neill.
I've started four nucs from swarms this year, and only one has been successful, sort of. If you count that all of the original bees are gone, including the queen and that I added brood from two different hives, the second frame coming after losing the half of the nuc to small hive beetles.
The bees teach me something new each time. Maybe I'll finally get the hang of it after 10 or 12 years.
Have you got the smell of the SHB out of your nose, yet?