The Didymos Prima meh dai carrier suitable for babies and toddlers. It has both wrap straps and is lightweight. Suitable for 7-18kg. It can be used for front, back and hip carries.
There are more videos and photo tutorials listed on the Carrying Matters website.
The Sheffield Sling Surgery website is here - full of useful information about safety, all sorts of articles about warm/cold weather carrying. knee to knee support, big kid carrying and so on
Facebook page is here and the online support group the Virtual Sling Surgery is here