Finding hydrated lime

[Alomran]

Perhaps build a shelter over your project (a cheap party tent?) which means you can work even if it's raining http://www.ebay.co.uk/itm/New-3-x-3m...-/121134907380 . Lime mortar will not carbonate under 5 degrees centigrade, so if you are intending a winter build you could add cement to enhance a faster set. However, South east England has a fairly mild winter, so you will be able to control the climate inside your party tent. It is well worth the investment, I built a shelter over my build, it means that i can work and mix mortar under cover.

I have just found on the net that for centuries in Yemen they have been building 15 floors high building by mixing only lime and mud!! They have also built a minaret that is 53m high!!!