Prioritize connectivity to major carriers and motorways, WMS integration and real‑time inventory visibility, scalability of labor and space for peak seasons, returns and reverse logistics processes, SLA performance history, and transparent pricing that includes inbound/outbound, storage, and surcharges.

Close access to Heathrow and the M25/M4 reduces transit times for air and road shipments, lowers last‑mile mileage into Greater London, and enables more efficient trunking. That can reduce transport spend and improve next‑day and express delivery reliability, but evaluate port/airport handling and fuel surcharges in pricing.

Look for pick/pack with slotting optimization, multi-channel order orchestration, batch and single-item picking, kitting and value‑add services, returns processing, integration APIs for storefronts/carriers, and clear SLA/penalty terms for on‑time fulfillment.

Use a total cost of ownership model that maps inbound, storage, pick/pack, outbound, returns and peak surcharges. Benchmark transit times and on‑time metrics, request sample pick/pack quotes for representative SKUs, and evaluate tech integration and contractual SLAs before awarding business.

Yes. Confirm whether providers offer customs brokerage, bonded storage or duty-deferment options, EORI handling, and experience with airfreight documentation through Heathrow. These capabilities reduce inbound delays and simplify customs clearance for international flows.