There are around 10,000 charity shops in the UK and most of them accept donations of good quality re-usable clothing and other textile items.
Most clothing banks are able to take a wide variety of clean used textiles even if the operator stipulates a preference for used clothing (no pillows or duvets though please). You can find out the location of your nearest bank and other textile collection services that operate in your area by contacting your local authority recycling section.
The Recycle Now recycling locator can also be a useful tool to find out where to recycling clothing and other items.
Find a recycling facility