DPD aren't allowed to deliver out of slot, it won't register on their doohickey, our driver has rung our bell before and let us know that he'll give us the package in 1 min time. TBH though, they are the best of the bunch and always reliable.
It either arrived on time or it was worthless as I would miss it.
Arrived smack on time, had my stuff in it about 30 minutes later and on a plane shortly after.
Ever so grateful, as it has lugged my stuff around since without some kit getting broken despite the best (or worst efforts) of the baggage monkeys at the airports I pass through.