In reply to sdw7300:
> A long spirit level is helpful!
Or a long, straight piece if wood and an average level
> If you're not in a hurry you can often pick up free or cheap second hand slabs from Facebook Marketplace etc
Yep - I just sold a load of slabs for about £2 each. I reckon the guy would probably have paid more, as he was short to finish a job, but pleased to get what I did and not have to pay to dispose of them at the tip, or even take them there.
Couple of years ago, I got some block paving very cheap from someone else for a small project.