//They’re not on the front line tho are they.//
Nor is my neighbour. She's a receptionist at a mental health clinic. But she's got an NHS ID card round her neck, went to the front of the queue when there were queues outside the supermarkets, and would no doubt be given 10% discount in Morrisons.
Without bus drivers many nurses would not be able to get to their front line. We're all interdependent. Without the post nobody would receive their call up to receive the vaccine, and without the bus neither the nurse administering it nor the patients receiving it would be able to get to the hospital. The patients would simply be recorded as "no shows" of course. :-)