Congrats on getting a start. Your approach to finding work would certainly be different to mine. But it’s worked out for you it seems so nice one.
Your DHL assessment is valid on all their sites. So if you don’t like that particular role you can fairly easily jump ship to another contract. Assuming it’s nothing specialised.
I’m actually a big advocate for having been ‘assessed’ at a number of big companies. I’ve got DHL, and a couple of Supermarkets. It basically means you can jump in and out of places very very easily.
P.S - wanna know a secret. I mainly drive class 1, and was recently asked to drive a car - and I actually did it. I’m being paid the same rate to do the job. I really couldn’t care what it is. But tha’ts just me.