when to wash your hands! Experts are advising that 'Destination Handwashing' (i.e. when you arrive home from work/shopping/the commute/school run etc.) is actually one of the most important times and it's one of those things that most people are not in the habit of doing!
There seems to be a lot of info about washing your hands for 20 seconds (i.e. for the length of time it takes to sing 'Happy Birthday' through twice) but very little about when to wash your hands.
Obviously everyone should still be washing after using the toilet and before preparing food but it's after train journeys; visiting shops/supermarkets and other busy places that it's most critical.