Prioritise 3PLs with direct access to arterial routes (M20/M2/M25), proximity to Dover and Channel Tunnel for cross‑channel freight, and reliable parcel carrier integrations. Look for demonstrated lane performance, SLA commitments, and contingency plans for peak seasons to minimise delivery variance.

Request standardized quotes with line‑item cost categories (storage, handling, inbound/outbound, returns). Compare measured throughput (orders/hr), SKU-level slotting rules, and occupancy rates. Require historical performance data and a pilot period to validate real throughput and cost-to-serve assumptions.

Essential capabilities include modern WMS with API/webhooks for order flow, carrier rate shopping, real‑time inventory visibility, analytics for fill rates and returns, and support for EDI or marketplace connectors. Confirm release cycles, uptime SLAs, and integration support for your ERP and storefronts.

Evaluate the provider’s peak staffing plans, overflow options (short‑term racking or shared buffer space), and documented returns workflows including inspection, refurbishment, and restock timelines. Also assess availability of value-added services such as kitting, labelling, and light assembly to reduce downstream handling costs.