Go on the CSV
site, there are thousands of voluntary jobs there.
There is no specified limit to how many unpaid hours you can work BUT whatever you do, make sure you clear it with the Job Centre first. They sometimes have a habit of saying you should be paid for the work you are doing and stopping your benefits.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates