Not strictly money earning, but if you've paid for any Powers of Attorney between April 2013 and March 2017, you can claim a partial refund (as the government has reduced the cost). I've just received a £90 refund
Further details are available here:
https://www.gov.uk/power-of-attorney-refund
Further details are available here:
https://www.gov.uk/power-of-attorney-refund