Having lived in London for 2 years (2003-2005) we were very frustrated with parcel delivery. The Royal Mail was pretty good as the doorman at our building held

Having lived in London for 2 years (2003-2005) we were very frustrated with parcel delivery. The Royal Mail was pretty good as the doorman at our building held packages for us, but other services such as DHL were hit or miss as they largely used independent contractors etc. That said, a "reliable parcel delivery service in the UK" would be hard to do unless you first start with portions of the UK and not everything. There are quite a few locales in the north that are quite out there and difficult to get to, some requiring one or more ferries etc. Not saying it can't be done, just not sure if it can be done without substantial investment.