Pea shingle instead of horticultural grit?

Unfortunately garden centres in Scotland are still closed 😔 Due to heavy clay soil I always try and incorporate lots of grit before planting but struggling to get a hold of it. I did manage to get some pea shingle but not sure if this would have any negative effect on the soil/ plants.
Any thoughts appreciated 🙂
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Using grit in a planting hole can result in a " sump " where water collects and doesn't seep back into the soil around it.
If and when you do feel you need to dig use a fork rather than a spade and when you plant, add some organic matter to the planting hole and its surrounding soil. Well-rotted garden compost, leaf mould, well-rotted manure will be fine as will spent compost from pots, cheap MPC compost or soil conditioners you can buy at the DIY or GC.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I started my own compost bin last year so hopefully I’ll have some of my own stuff out of that in the next month 🤞
Adding the mature is making such a difference although the digging is tough work!
Adding in compost has really helped the flower borders but my lawn is still a mud bath
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw