Water (and Money!) Saving

Seeings as we live in the most expensive area in the UK for water rates we have picked up a tip or two on how to save water, and money in the process. Some of these ideas may be slightly out of your own means or comfort zone and that's fine. Using just one of these methods can cut your water bill significantly.
So here goes:

• Do not pull the flush on your toilet unless its a number 2. If its yellow let it mellow, if its brown flush it down.
• When running the tap to get hot water (thanks crappy boiler) you can keep that water and use it for cooking, drinking, or washing your hair with.
• Save rain water in barrels and use it to either wash your hair (ultimate soft water) or use it to flush the loo. Its not recommended to eat or drink this water.
• Go onto your local water provider website. Most offer water saving packs such as Hippo Bags, shower timers and tap pressure changers for free. 
• Start a no poo journey (see No Poo Wiki) and wash your hair once a week or less!
• Water your plants with used dish water. 

Have I missed anything that you would like me to add? Let me know in the comments :)