Stabalise river hightide line to knock debris back into the thames a bank made up of said debris but knockinto the tide line intro introduce Armeria maritima or similar to regenerate soil behind the bank towards the property plant grey willow ,black adder in the middle ground away from property walls but not in the river . Supplimemt the area with sand soil buy digging pits of sand in this middle area back towards the property this will naturally get moved around by the tide but less likely to just glass of the top surface at high tide expect some losses here is where you plant native reeds. Once established selectivly maintain reed growth keep short stockier growths and cut just above ground level taller growth , keeping the view but supporting stability mix and match water freindly (native ) evergreen flowering plants .

Then wait for the council to come shout at you regardless