Sorry for delay in replying ... soil pipe started leaking at back of house... turns out to be asbestos ... enjoying "dirty" water on brand new patio, whilst negotiating plumbers and asbestos specialists, whilst also trying to spend less than £2k. Ho Hum.Anyway ... fire pit ... think of it as somewhere to have a camp fire rather than anything fancy. My current 5yr old amazon £30 fire bowl is just a wide metal bowl with no vent holes at all. The legs have fallen apart, so I have removed them with my multi saw. I now have just the bare metal bowl. I think I will drill a few holes in the bottom for drainage, and some hole round the side for ventilation. I will then partially sink it into the ground, but can easily lift out to empty ash etc.