Help with garden slabbing materials needed please

Your slabs want about 50mm solid cement and sand bed with anywhere from 50_100mm type 1 or any hard wackered bed as long as it's hard and doesn't sink and sufficient drainage it will be fine

6/7 tone of MOT type stone 3.5 tones of sharp sand an 20 cement

Part of the answer I saw was right and I can't provide a better answer just a different one. The advice to you on depth of dig is spot on and standard on a level ish playing field at back or front of property. The best coursing for your depth also depends on thickness of slab. E.g 100mm HC 30 mm of full bed of cement mix, usually 6-1 for standard slabs (sandstone)with a thickness of 22mm with a tolerance of 5mm gives you your 150 depth. That of course all depends on fr ground condition and slabs. As for you amounts, there are a number of calculators online for your question. But for argument sake if your patio is 36m and you have a 80mm compacted type1 base, 6 tonne. 6-1 sharp sand bedding mix. 2.8 tonnes and 22 bags cement. With a 22mm slab. Hope that helps!

You need to dig out 150 mm 200mm lay weed barrier. lay 100mm - 120mm hard core or type1 wacker plate till it's hard. About 50mm sharpsand & cement to lay slabs on