Going on an appointment to save money on a client's energy bills... only charging £5 (should only take 10-15 minutes)... I reckon I'll save him around £200 per year. If you want me to perform a similar service please let me know :). I'm also available for online consultation.
Actually recieved £10 for doing it (he wanted to give me £10 plus free drinks and chocolate). Saved around £200 per year... by staying with the same provider! Enjoyable and ready to do again!