Here's how you make money from letting agent agent small jobs:I've done two this morning, in the same town half a mile from each other.
First one was "make safe some bare wires" on a house being prepared for sale. The bare wires turned out to be the old redundant tails from when the economy 7 supply was removed. they weren't dangerous, just looked so to the eyes of a surveyor. 5 minutes to disconnect and remove them. That's a minimum charge 1 hour to the agent.
Second one was replace that faulty shower switch. Took about 30 minutes in total. Again another hour bill plus the cost of the new switch.
And by doing them on the same day, only one (15 mile round trip) travelling expense to absorb.
I think the message I am trying to give, is you are not on 24/7 emergency call out, and most jobs can wait a few days to fit in with your schedule. that way you can do small jobs efficiently and make money on them.
the further I have to travel, the more I like to bunch up jobs in the same town for the same day.