Could try Brakes at Bishops Stortford, a bit of a trek especially considering it’ll be early starts but they usually pay well and take on new passes.
It won’t be easy work, multi dropping food to schools and the like but you will learn fast and gain experience.
Royal Mail were recently looking for 7.5t temp Christmas drivers at Boreham tbrough agencies, very good rates.
Otherwise my usual advice is to dress tidily and go doorstepping, take a card or CV to companies who run trucks. Especially ones that are not all shiny and doing easy work.
You might find that you are in the right place at the right time, possibly starting out on a van or 7.5t.
Nothing to lose and its worked for plenty before.