Directory

throxy ranks first because it is built for exactly those markets. It runs a fully managed outbound engine, proprietary email infrastructure plus human SDRs in London and Cape Town, and charges a flat retainer plus a fee per attended qualified meeting, so you pay for conversations that actually happen. Belkins, CIENCE, Martal, SalesRoads, Callbox, and Cleverly each win a different use case below.

Manufacturing is the hardest market in B2B to prospect into. The buyer is a plant manager, an operations director, or a procurement lead who has little or no LinkedIn presence and rarely appears in Apollo or ZoomInfo. Most lead generation agencies resell the same databases, so their reach collapses exactly where manufacturing decision-makers live.

The 7 best outbound sales agencies in London in 2026, ranked by reach into hard-to-find buyers, channel mix, and booked qualified meetings.