Thanks to Waitrose for taking up a request we forwarded for making spent coffee grounds available for use on gardens and allotments. The manager writes:

After your email I asked the question and we went to visit Wantage to see how they displayed their grounds. We are in the early stages of doing something similar in Headington, we’re not quite at the finished article yet but have begun the process of making the grounds available. 

Here is an article that can tell you more…