How much does Harwell Dosimeters Limited make?

Harwell Dosimeters Limited reported revenue of £5.4m and £2.5m profit in the year to 31 Mar 2025, according to its accounts filed at Companies House.

How many employees does Harwell Dosimeters Limited have?

Harwell Dosimeters Limited reported an average of 21 employees in the year to 31 Mar 2025.

Is Harwell Dosimeters Limited profitable?

Yes — Harwell Dosimeters Limited reported a profit of £2.5m in the year to 31 Mar 2025.

Company No. 02917906 · Incorporated 12 Apr 1994

Harwell Dosimeters Limited

Registered name: HARWELL DOSIMETERS LIMITED

Part of Steris Public Limited Company group

Harwell Dosimeters Limited made £5.4m revenue and £2.5m profit in the year to 31 Mar 2025. read from filing text

Harwell Dosimeters Limited’s revenue grew 11% to £5.4m in the year to 31 Mar 2025, with £2.5m profit and 21 employees. The company is classified under “manufacture of other plastic products” and is based in Basingstoke; we hold 4 years of its filed accounts.

Full P&L filedSection C · ManufacturingSIC 22290Manufacture of other plastic products

Status: Active
Location: Basingstoke, South East
Age: 32 yrs · since 1994
Type: Private Limited Company

Part of a group. The filing indicates this company sits within a group structure, so its results may depend on intra-group trading and it may be hard to replicate independently. From the filing: “The parent company of Harwell Dosimeters Limited is Synergy Health Holdings Limited. Its registered office is 2200 Renaissance, Basing View, Basingstoke, RG21 4EQ.”

Latest accounts · year to 31 Mar 2025

Key figures

Operating leverage

Revenue

£5.4m

Growth ▲11.1%

Profit

£2.5m

Growth ▲24.6%

Profit margin

45.4%

Gross 91%

Employees

Change 0%

Profit / employee

£117k

Revenue/employee £258k

Profitable streak

4yrs

Consecutive profitable years in our data

Badges are automated estimates derived from the filed figures — not statements of fact about the company.

4 filed years

Financial history

Multi-year financials, oldest to newest
Year to	31 Mar 2022	31 Mar 2023	31 Mar 2024	31 Mar 2025
Disclosure	Full P&Lread from filing text	Full P&Lread from filing text	Full P&Lread from filing text	Full P&Lread from filing text
Profit & loss
Revenue (turnover)	£2.7m	£3.8m	£4.9m	£5.4m
Cost of sales	£1.5m	£1.2m	£804k	£489k
Gross profit	£1.2m	£2.6m	£4.1m	£4.9m
Operating profit	£157k	£1.5m	£2.6m	£3.3m
Profit before tax	£157k	£1.5m	£2.6m	£3.3m
Profit after tax	£152k	£1.2m	£2m	£2.5m
Profit (best available)	£152k	£1.2m	£2m	£2.5m
Staff costs	£790k	£898k	£984k	£925k
Employees (average)	16	21	21	21
Ratios
Profit margin	5.7%	30.9%	40.5%	45.4%
Gross margin	45.3%	67.8%	83.5%	91%
Revenue per employee	£166k	£183k	£232k	£258k
Profit per employee	£9.5k	£56.7k	£94k	£117k
Growth (year on year)
Revenue growth	—	▲44.7%	▲26.7%	▲11.1%
Profit growth	—	▲683.6%	▲65.9%	▲24.6%
Headcount growth	—	▲31.3%	0%	0%
Balance sheet — indirect signals, not revenue
Cash at bank	£1.6m	£2.3m	£2.3m	£1.4m
Net assets	£3.1m	£4.3m	£3.8m	£3.5m
Fixed assets	£1m	£939k	£992k	£1.2m
Current assets	£3m	£4.6m	£4.6m	£4.8m
Debtors	£264k	£370k	£274k	£870k
Deferred income	£136k	£101k	£130k	£132k
Source	FullAccounts · bulk data Feb 2024	FullAccounts · bulk data Feb 2024	FullAccounts · bulk data Feb 2025	FullAccounts · bulk data Oct 2025

Derived from the latest filing

How the business works

Profit margin: 45.4%; Profit ÷ revenue.
Gross margin: 91%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £258k; Revenue ÷ average employees.
Profit per employee: £117k; Profit ÷ average employees.
Cash conversion: —; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 22.9%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: 2.4%; Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue: 16.1%; Money owed by customers. Low = customers pay quickly.

Indirect — not revenue

Balance-sheet signals

Year-on-year changes in filed balance-sheet items. They can hint at momentum (or investment) but are not revenue or profit and must not be read as such.

Net assets: ▼9%; Now £3.5m
Cash at bank: ▼38%; Now £1.4m
Headcount: 0%; Now 21
Deferred income: ▲2%; Now £132k
Fixed assets: ▲25%; Now £1.2m

Deferred income is reported together with accruals in this filing (“accruals and deferred income”), so it is an approximate signal only.

Corporate ownership

Group structure

Ownership chain

Steris Public Limited Company (registered outside the UK register)ultimate parent75–100%
Steris Limited75–100%
Synergy Health Limited75–100%
Synergy Health Holdings Limited75–100%
Harwell Dosimeters Limitedthis company

Bands show the share of ownership each company holds in the one below it.

Sister companies (5)

Synergy Health (UK) LimitedRev. £105m · Profit £7m
Synergy Health Sterilisation UK LimitedRev. £55.4m · Profit £16.6m
Synergy Health Systems LimitedRev. £9.3m · Profit £381k
Medisafe Holdings LtdRev. £0 · Profit £10m
Shiloh LimitedRev. £0 · Profit −£466k

From the Persons with Significant Control register (corporate controllers only).

Same industry, similar size

Similar profitable businesses

Industry benchmarks →

Sources

Companies House profile Filing history & original accounts

Latest figures from FullAccounts for the year to 31 Mar 2025 (profit £2.5m), from the Companies House accounts bulk data published Oct 2025. Spotted an error? Request a correction.

Contains public sector information from Companies House licensed under the Open Government Licence v3.0. Data from Companies House, © Crown copyright. View the licence.