I usually have an ‘allowance’ from my salary of just over £200 o spend as I wish.
I am incapable of sticking to it.
So having no spend jan meant cutting dead any additional spending. No ‘I’ll just buy lunch at work” or “just a coffee from Nero’s” and no buying crisps/chocolate/etc for snacks. Also, no newspapers, books (including kindle unlimited which I am a sucker for), nothing new for the kids, etc. Also no ‘I just need’s - if i didn’t already have X, it didn’t happen.
End of the month and I have the entirety of that ‘spending money’ still sitting there. Plus I haven’t spent the ‘extra’ on top and don’t need to find money for the credit card.
It also turned out that i didn’t ‘need’ anything. 
In terms of the rest of my spending, I’m working on reducing the grocery budget. More vegetable based meals, plus taking better advantage of deals.
For half term, we have two messy sessions (free) at a local church, plus the cinema trip. I reckon that’s enough when you take library and toys at home I to account.