You don't need to be home to accept your parcel as our orders are dispatched with Authority to Leave (ATL)* by default.
If you're not home when delivery is attempted, the courier driver will leave your parcel in a safe place. If they deem it unsafe to leave your parcel unattended, they'll leave a collection card and you can collect your parcel from your local post office.
I've been notified that my order has been delivered, but I haven't received it!