A buffer before the delivery window is a deliberate pause on the British side shortly before the delivery into a warehouse. It separates two things that normally travel together and fail together: crossing the border and entering the consignee’s site. A delay at the crossing then stops eating the receiving appointment, because the run to the gate starts in England, on a short leg that can be planned to the hour.
What the buffer actually separates
A direct delivery from Poland into an Amazon warehouse chains four events with very different predictability: loading, the road run, the crossing with customs, and the receiving appointment. The first three have a spread measured in hours; the fourth is a point. When the spread exceeds the slack, the appointment goes, and the consequences are described in the article on a missed delivery window. A buffer moves the whole spread in front of the warehouse: the goods arrive when they arrive, and leave on their own schedule.
An important caveat: goods enter the warehouse only after import clearance, which follows from their customs status rather than from how we organise work. We explain that in the article on why goods enter storage only after import clearance. We do not operate a customs warehouse in Milton Keynes, so units standing in a buffer are already in free circulation.
The arithmetic: what you weigh against what
On one side sit the costs of the buffer: receiving the unit, days of storage, release and the short run to the gate. How those are charged is described in the article on pallet-in and pallet-out billing. On the other side sits the cost of the scenario you are avoiding: a vehicle waiting at the gate, a second delivery attempt, sales pushed back by however long the next free appointment takes, and, in peak, the risk of dropping out of the demand window altogether.
We do not quote rates or a number of days, because both depend on the batch and the season. What we do offer is the question that settles it: what does one day of delay cost in your sales, compared with one day of storing a pallet. If the first figure is clearly higher, the buffer earns its place, and it earns it more the tighter the receiving calendar gets.
How long the goods stand
Briefly, and that is the whole point. The buffer runs from receipt to departure for the appointment, and in most cases covers a few days. If it turns out the goods are standing for weeks, that is no longer a buffer but stock held in Britain, and the whole arrangement needs recalculating. What happens to units that stand longer than planned is covered in the article on how long goods can stay in storage.
When a buffer makes no sense
- When the appointment is far off and there is ample slack for the crossing anyway. You are then adding a link without reducing risk.
- When the batch is a one-off, small and not time-critical. Receipt and release costs spread over too little volume.
- When the goods travel as a full load to one specific appointment on a schedule that is tight in the other direction, leaving no room for an extra day in a warehouse.
- When the only problem is how the pallets were built. Then what you need is not a buffer but one-off work on the units, described in the article on pallet preparation before an Amazon delivery.
What we need to know before receipt
Before receiving goods we need the unit count, dimensions and weight, a description of the goods, any temperature requirement and the planned release date. That last point matters in practice: a unit we know is leaving in three days goes to a different place than one expected to stand longer. The full data list is collected in the article on how to book a warehousing service. It is also worth settling upfront who books the delivery into the warehouse and by when, because a buffer tidies up the logistics, not the consignee’s calendar.
Sources
- Amazon Carrier Central: palletised delivery bookings and receiving appointments
- GOV.UK: goods movement reference at the border
Want to separate the border from the receiving appointment? Describe the batch and the planned deliveries in the quote form and we will cost the arrangement with and without a buffer. The site is described on the Milton Keynes warehouse page.
