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Company · 1951–2026

Seventy-five years of TriOptimum

On 14 March 1951 three engineers signed the lease on a workshop in Mill Lane, Halsworth. To mark seventy-five years since, we are opening our doors, drawing our products again and paying for the training of the next generation of engineers.

The anniversary drawing set

The drawing office of TriOptimum Research Laboratories has drawn a set of sheets for the anniversary, in the conventions our engineers have used since the 1950s: one product or place per sheet, a title block, and nothing that is not needed. Sets printed on cartridge paper were given to every employee with more than twenty-five years’ service.

PRODUCT LINEAGE 1951–2026 An engineering drawing lining up five TriOptimum products on a common ground line: the Model 1 pressure gauge of 1951, the RC-12 relay cabinet of 1968, the AccessNet 4K keypad of 1993, a 42U network rack of 2011 and the HG-40 hydroponic grove module of 2017, with a dated baseline beneath them. 112233445566AABBCCDD - - - -1350 AFF12345195119681993201120172026GENERAL ARRANGEMENT · FRONT ELEVATIONSOBJECTS SHOWN AT INDIVIDUAL SCALES. NOT FOR MANUFACTURE.PARTS LIST1 MODEL 1 PRESSURE GAUGE2 RC-12 RELAY CABINET3 ACCESSNET 4K KEYPAD4 42U NETWORK RACK5 HG-40 GROVE MODULE TITLE PRODUCT LINEAGE 1951–2026 DWG NO. TRI-75-0001 SCALE NTS REV C DRN / CHK TRL-DO / QA-04 DATE 2026-01-14 SHEET 1 OF 1
TRI-75-0001. Five products on one ground line, from the Model 1 pressure gauge of 1951 to the HG-40 grove module of 2017.
MILL LANE WORKSHOP 1951 · PLAN Reconstructed floor plan of the rented workshop on Mill Lane, Halsworth, where TriOptimum was founded in 1951: a single room about twelve by seven metres with a door to the lane, three windows, a long workbench, a lathe, a calibration bench with the dead-weight tester, stores shelving, a coke stove, and three desks in the corner for the founders. 112233445566AABBCCDD APEMSO123456712 0007 200MILL LANEKEY1 WORKBENCH WITH VICES2 CALIBRATION BENCH AND DEAD-WEIGHT TESTER3 LATHE4 STORES5 COKE STOVE6 DESKS: A. PELLOW, E. MARCHBANK, S. OSTROWSKI7 DOOR TO MILL LANERECONSTRUCTED FROM THE 1951LEASE PLAN AND PHOTOGRAPHSIN THE CORPORATE ARCHIVE. TITLE MILL LANE WORKSHOP 1951 · PLAN DWG NO. TRI-75-0014 SCALE 1:50 REV A DRN / CHK ARCH-DO / TRL-DO DATE 2026-03-09 SHEET 1 OF 1
TRI-75-0014. The founders’ workshop on Mill Lane, reconstructed from the 1951 lease plan.
ACCESSNET K9 · FRONT AND SIDE Front and side elevations of the AccessNet K9 keypad controller: a twelve-key keypad below a small display, 70 by 112 millimetres, 24 millimetres deep, mounted at 1,350 millimetres above the finished floor. 112233445566AABBCCDD - - - -1350 AFF7024FRONTSIDE TITLE ACCESSNET K9 · FRONT AND SIDE DWG NO. SP-K9-G-0010 SCALE AS SHOWN REV D DRN / CHK SP-DO / SP-QA DATE 2025-06-02 SHEET 1 OF 1
SP-K9-G-0010. The AccessNet K9, which still reads code tables written for the AccessNet 4K of 1993.
HG-40 GROVE MODULE · SECTION Section through an HG-40 hydroponic grove module: three growing tiers, each with its own lamp bar and nutrient tray, a base plinth and a service riser for water and air. Overall width 4,000 millimetres, height 2,980 millimetres. 112233445566AABBCCDD 40002980 TITLE HG-40 GROVE MODULE · SECTION DWG NO. AG-HG40-G-0001 SCALE 1:20 REV E DRN / CHK AG-DO / AG-QA DATE 2023-09-12 SHEET 1 OF 1
AG-HG40-G-0001. The HG-40 grove module, designed for Citadel Station and now growing lettuce in Almere.

Open days at Halsworth Park

The anniversary open day on 3 October brought 11,600 visitors to Halsworth Park, more than the campus had ever held. Because so many people could not get into the founders’ workshop before closing, the campus is open to the public on the first Saturday of each month until the end of the year.

Visitors can see the rebuilt Mill Lane workshop, watch a Model 1 gauge calibrated on the original dead-weight tester, tour the materials hall of the Research Laboratories and visit the Corporate Archive’s anniversary display. The Vault Works is open on request.

Entry is free and there is no need to book. Parking is at the north gate. The campus is step-free except for the workshop, which has a ramp.

Open days, 10:00 to 16:00
DateNotes
Saturday 3 October 2026Anniversary open day. 11,600 visitors.
Saturday 7 November 2026Including the archive’s talk on the AccessNet 4K at 11:00 and 14:00
Saturday 5 December 2026The last open day of the anniversary year

The apprenticeship fund

Students and graduates

In January 2026 the Board set aside £7.5 million to pay for 750 engineering apprenticeships over five years in the communities around our largest sites. Apprentices are recruited locally, train for a recognized technician qualification while they work, and are not required to stay with TriOptimum when they finish.

The first 150 apprentices started in September 2026, in field service, data center operations, manufacturing and laboratory engineering.

Apprenticeships funded, 2026 to 2030
CountryPlacesMain sites
United Kingdom300Halsworth Park
Canada170Toronto, Vaughan
Australia160Perth, Kalgoorlie
Netherlands120Leiden, Wageningen, Almere