Yanbu, that’s pretty poor really
I know in Guiding occasional parent helpers don’t need a DBS and therefore can’t ever be unsupervised with the children. I don’t know if Scouts is the same as the two organisations are separate, but it would make sense as many units can’t function without parent helpers, as long as the parents are always supervised by a leader (who would be DBS checked) I imagine it’s ok.
If your DH is helping most weeks I would suggest he’s more than an occasional helper and should be DBS checked though tbh.
I’m surprised they’ve not bitten his arm off if he’s offering to be leader though! I believe there’s a leadership qualification and would imagine there’s some kind of training or mentoring that should be in place?
The leaders are volunteers. If you’re not in Scotland it’s still the summer holidays, some leaders do like to have a proper break from Scouting over the summer. And people are away and it’s hard to co-ordinate people who all have different holidays. It’s not great to ignore volunteers though, especially one willing to train as a leader!
Scouting and Guiding are very rewarding to be a part of. It’s great to be able to give kids the experience but it’s a great personal experience for leaders as well, which is why so many people do it for decades. I hope this doesn’t put your DH off volunteering, he’s very much needed!