Hi do's any one have any instruction on how to build a composting loo for our allotment as we would like to make one if we can.
My first suggestion would be to contact/go to The Centre for Alternative Technology (www.cat.org.uk). They sell books on humanure and composting.....
No 1's are easier to deal with - you could use a straw bale for it, or use a container to pour on the compost heap (great compost activator).
No 2's - well, I don't know a lot about this, but preferably, this should be dealt with separately to No 1's.
There are companies that sell toilets which try to keep 1's and 2's separately.
Read the Humanure Handbook (http://www.jenkinspublishing.com/humanure.html) you can download a free copy or buy a hard copy if you prefer.
You are really talking about an "Earth Closet", a wooden hut about four feet by two and a half to three feet, with a seat (with a hole in it) and no floor. Dig a hole in the ground and place the hut over it. Anchor it down well. If you want full instructions, try to get a copy of "The Specialist" a very small book by Charles Sale. This book is one of the most successful, my copy is one of the 698th thousand at the time, cost £1.25 in 1979. It was first published in 1930.
There is quite a lot of info on the Net about "dry toilets":
http://www.cat.org.uk/information/catinfo.tmpl?command=search&db=catinfo.db&eqSKUdatarq=InfoSheet_CompostingToilets (http://www.cat.org.uk/information/catinfo.tmpl?command=search&db=catinfo.db&eqSKUdatarq=InfoSheet_CompostingToilets)
or
http://www.oursoil.org/drytoilet.php (http://www.oursoil.org/drytoilet.php)
try searching under various names, such as composting toilet, compost human waste etc
sounds like a good initiative! In Oz there are usually composting loos in the national parks and many outdoor places, I found them to be great, they don't smell if they are properly built and maintained.