T
yes....why has it been sited against the building?....it would have been better a minimum of 1 meter away...where it isn`t going to be intercepting any foundation rubble...or any other crap the original builders decided to throw in there.....Not sure why everyone is obsessing about an alleged trip hazard. It is against a building, and besides, every house I've ever owned/visited has had literally dozens of levels in the garden and pathways including flowerbeds, brickweave paths, patios, raised beds, drain covers....
Pea shingle filled to the level of the concrete won't create a hazard any more than having gravel on your drive!!!