CONSTANT SYSTEMS LIMITED

ImporterExporter

UK traderHMRC trader directoryref 310781

Directory snapshot: 2026-09-12. Address observation date, not a trade date.

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Published as both an importer and an exporter, against 11 commodity codes in chapter 90, chapter 84 and chapter 85.
Published in 59 of the 61 months from July 2021 to July 2026. A missing month is one with no published link, not a month without trade.
Concentrated in chapter 90: 7 of the 11 loaded codes are in chapter 90.
The chapter 85 codes are import only.

11commodity codes on the record

59months published

84published trader and code links

5.1 yrs2021-07 to 2026-07

What it trades

Grouped by tariff chapter, most published codes first. Descriptions are HMRC’s own, verbatim. This list is bounded: codes outside the loaded coverage are not listed.

Chapter 90Published 2021-07 to 2026-077of 11 loaded codes64%

9027 89 90Instruments and apparatus for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s.ImportExport54

9027 89 10Exposure metersExport8

9027 80 80Instruments and apparatus for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s.Export5

9027 89 30pH meters, rH meters and other apparatus for measuring conductivityExport4

Show the 7 sampled codes

9026 90 00Parts and accessories for instruments and apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases, n.e.s.Export1

9027 10 90Non-electronic gas or smoke analysis apparatusExport

Chapter 84Published 2022-10 to 2026-073of 11 loaded codes27%

8479 89 97Machines, apparatus and mechanical appliances, n.e.s.Import3

Chapter 85Published 2025-01 to 2025-011of 11 loaded codes9%

8536 50 80Switches for a voltage of > 60 V and <= 1.000 V (excl. relays, automatic circuit breakers, electronic AC switches consisting of optically coupled input and output circuits "insulated thyristor AC switches", electronic switches, incl. temperature protected electronic switches, consisting of a transistor and a logic chip [chip-on-chip technology] and electromechanical snap-action switches for a currImport

What it trades

Months published

A filled cell is a month with at least one published link in the loaded scope. A gap is a month with no published link, not a month without trade.

at least one published link
no published link in this month
outside the loaded window

Months published

Address as published

11 LOW MARCH INDUSTRIAL ESTDAVENTRYNORTHAMPTONSHIRENN11 4SD

Printed exactly as HMRC files it, spelling and spacing included. It is the address on the trader entry, not a verified registered office.

On the same codes

Traders published against the most of the same codes. A shared code is a shared commodity, not a relationship between them.

On the same codes

What is on this page

Trader and commodity code linksWhich codes HMRC published this trader against, month by month.
Direction per codeImporter, exporter or both, as filed for each code.
Published window and addressFirst and last month on the record, and the address as filed.
No values, counterparties or shipmentsHMRC publishes the trader–code link, not what moved, who was on the other side, or through which port. Suppressed cells and trader opt-outs make the directory a floor, not a census.

Coverage and refresh dates

Loaded activity: HMRC import and export records across 98 tariff chapters, Jan 2016 to Jul 2026. Named records begin in 2016 for UK trade with non-EU countries, in 2021 for Great Britain’s exports to the EU and in 2022 for its imports from the EU. Northern Ireland–EU trade and traders who opt out are excluded. The current trader directory is a separate snapshot.