It's difficult to know whether DH's industry is quiet because it always is over the summer or whether it is Brexit-induced. I guess time will tell.
Paying off the CC was a lot of careful budget tracking. If we didn't spend it we immediately moved it across online to the CC. It meant paying £20 here and £10 there but it all built up. We figured if it wasn't in the account we couldn't spend it! The buffer was a sort of right place right time thing. DH was offered some lucrative work but it meant working away. He did that for 9 months. I also had a promotion in that time (well three actually) but we didn't spend any of the extra and threw it all at reducing our debt. Then there's the usual stuff like meal planning, curtailing pester power etc. It was a lot of small things.
We've looked at the budget this morning and we can see a few places to tighten our belts. I've done a freezer inventory so I know what we have. I've been to the pound shop for toiletries and done an Aldi shop (we had got into the more expensive habit of booking online shops from Sainsburys)
I've started a list of free and cheap activities we can do with the children. I think I'm going to write them out on pieces of paper and pop them in a box. The children enjoyed not knowing what we were going to do when we did that before - kind of made otherwise normal activities into surprises.