I've been buying my washing up, wool wash and dishwashing detergents here for around seven years. Most of them come in the 5L containers as standard, though there are bigger sizes (10 or 20L), and only a few, if any, come in anything smaller. My washing detergent lasts a year (in a small household) and I probably waste a good deal (suggest decanting to a smaller bottle, but I haven't got around to it), the wool wash and dishwasher detergent - well over that time. They also have a bbq cleaner, degreaser and several others. Great quality, cheap as chips and they take back the empty containers when you're finished. Can't miss the shop front, but if the door is closed, walk down the drive and the open shed door on the right - call out if they don't see you first.