A few years ago I saw an episode of Supernanny where the mother's "problem" was that she still breastfed her 3 year old on demand. Before that it had never occurred to me that people breastfed 3 year olds 
Now my ds is almost 12 months. In the last couple of weeks two different friends of mine have asked if I am still feeding him - and then have revealed that they were breastfed until around 18 months/toddler age. And this was working class families in England in the 1980s, so not the stereotype of extended breastfeeding. It makes me wonder how many people do it in secret?
Are any stats collected on breastfeeding beyond 6/12 months in the UK, does anyone know?