It is worth it.
When I worked in an office I managed a wholesome £28k with all the stress and grief that it involved.
Decided to go self employed so took the Class 1 as “filler” work for when there was nothng else to do. It allows me to concentrate on running my own stuff in the day and then work at night. Plus I can drop it at a days notice if something comes up.
A lot depends on the wages. Some places paid crud. £7-9/hour and you were never going to get more than 8 hours a day. The current one pays well. £11+ per hour with an avg of 55 hours.