Your Supplier Is Getting Slower — You Just Haven't Noticed Yet

The Lead Time Drift Nobody Notices#

Amy runs a gift and homeware shop in Bristol. She orders from 12 suppliers. Her main supplier, a wholesale ceramics importer, agreed to deliver within 10 working days of order. For 2 years, this was reliable — actual delivery averaged 9.3 days. In Q3 last year, they had a warehouse move. Delivery times started slipping: September: 11 days average. October: 12.5 days. November: 14 days. December: 16 days (peak season). Amy's reorder point was calculated on 10-day lead time. In November, she ran out of her best-selling candle holder 2 days before an expected delivery. She missed an estimated £1,200 in sales over those 2 days. In December, she ran out of 3 items during Christmas week — each with 4-5 days of stock-out. Total lost revenue: £3,800. Amy never connected the dots. She thought she had "bad luck" with stock timing. She didn't know her supplier's lead time had increased 60% over 3 months.

Why Lead Times Increase — And Why It's Hard to Notice#

Supplier lead times increase for many reasons: (1) Supplier volume growth — they're taking on more customers, warehouse capacity is strained. (2) Manufacturing or import delays — longer port dwell times, customs inspections. (3) Seasonal demand — other buyers are ordering more at peak times, pushing your order further down the queue. (4) Supplier quality issues — items failing QC inspection on first pass, requiring rework. (5) Staffing problems at the supplier — packing team turnover. The increase is gradual — 1-2 extra days per month. Individually, each delivery is "a bit late." Collectively, over 3 months, the effective lead time has changed by 50-100%. Small businesses don't track this systematically. They notice when they're out of stock — not when the trend starts.

AskBiz Weekly Supplier Lead Time Dashboard#

AskBiz tracks every purchase order: order date, expected delivery date (agreed lead time), and actual delivery date. The weekly dashboard shows: (1) Actual vs. expected lead time by supplier over the past 12 weeks (trend chart). (2) Suppliers whose actual lead time has increased >20% vs. their 6-month average. (3) Current reorder point for each product (calculated from your actual lead time data, not the agreed lead time). (4) Stock-at-risk: products where current inventory will run out before the revised lead time delivery date. For Amy: the dashboard would have shown in October: "Ceramics supplier: actual lead time 12.5 days (agreed 10 days, +25%). Your candle holder reorder point should be updated from 10 days to 13 days of safety stock." A 30-second adjustment. £3,800 in stock-outs prevented.

Adjusting Reorder Points Dynamically#

AskBiz adjusts reorder points automatically based on actual lead time data. For each product, it calculates: safety stock = daily sales velocity × (actual lead time - agreed lead time + 2 days buffer). When the ceramics importer's actual lead time hits 14 days vs. 10-day agreement: Safety stock increase = daily sales × 4 extra days = e.g., 3 units/day × 4 days = 12 extra units of safety stock required. AskBiz updates the reorder trigger automatically. No manual recalculation. No remembering to adjust. The system watches the supplier's performance and adapts your ordering behaviour accordingly.

Supplier Conversations Backed by Data#

AskBiz lead time data also enables a different kind of supplier conversation. Instead of: "You've been delivering late recently. Can you improve?" (vague, easy to deflect). You have: "Over the past 8 weeks, your actual delivery time has averaged 14.2 days vs. your 10-day SLA. In the week of November 12, we had a 5-day stock-out on item SKU-4421 directly attributable to the late delivery that week. We estimate £1,200 in lost revenue. We need to understand your corrective plan, or we'll need to source a second supplier for this product line as contingency." Specific dates, specific SKUs, specific revenue impact. This is a business conversation, not a complaint. It gets taken seriously.

Building a Resilient Supplier Network#

Weekly lead time monitoring enables a strategic view of your supplier portfolio. AskBiz generates a supplier reliability scorecard: On-time delivery rate (last 12 weeks). Average lead time vs. agreed SLA. Lead time variability (consistent vs. erratic). Stock-out incidents attributable to late delivery. A supplier with 94% on-time delivery and consistent 10-day lead time is a reliable partner. A supplier with 67% on-time delivery and lead times varying from 8-18 days is a risk — you need either a backup supplier or higher safety stock to compensate. This scorecard informs strategic decisions: which suppliers to grow, which to put on notice, and where to qualify alternatives.

• Stock-outs are the most expensive retail problem — you lose a sale, potentially a customer, and can't recover the revenue.
• Most stock-outs are caused by supplier lead time drift that the buyer didn't notice.
• AskBiz tracks actual vs.