Do a narrow trial hole with a narrow spade and find out where the foundations are ?? Like woody said it's a downward force rule then apply the 45 deg rule. If the floor level inside is high however the house was designed to have the soil there permanently...regardless of rules and health and safety common sense applies also..ie.the property has had that soils up again it's lower walls for many years....... Good luck with it
I did do a test hole approx 1 metre deep and hadn't hit the foundations but have 0.5 metres to go before i get to ground level
The air bricks are approx half a meter above the soil
Pic below of test hole i dug
https://www.diynot.com/diy/media/img-20190902-wa0000.103248/
https://www.diynot.com/diy/media/img_20190902_113900.103247/
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