I could go to the Norfolk Coast or Salisbury Plain and get loads too but alas we are in a Lockdown due to Covid and living in West Wales it's pretty impossible at the moment... But thanks for the idea
I understand the problem to here offer a possible solution, why not check out the geology of the region in which you live, to see if there is any flint or chert bearing sites in your own locale. For sure your local council website will have a geology section to consult. If you identify a possible site you might have to dig or find a watercourse that has dug to reveal but how far removed is that from what folk in the ancient past had to do, as something I was watching last night on U tube about some famous flint bearing ridge in the US revealed the natives had to dig for it as modern do folk with pneumatic backhoe chippers.
But to explain my interest and why I was watching what I was last night, I too have an interest in finding 'hard rock' from which to scrape metal to create sparks and beyond, the knapping, to through observing local geology surveys and observation, know flint nodules wash up on my local beach from time to time (and volcanic glass after storms). Something which I rather soonish intend to observe in earnest as I too have an interest in the 'primitive'
But beyond that, how far are you away from 'flint' shire in NE Wales?