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If that's sandstone - brush / grind out the crumbly bits, Namurian rock to harden it, a few epoxied bolts to key to, then fill with lime mortar. You may need to build a form and / or use chicken wire / metal bolts to key the material to.
conserv.co.uk are a good resource.
NotThamesWater
I’d like to glue this stone bit back on before it gets worse.
I thing it’s been caused by the shutter hinge rusting and expanding.
What would you use.?