Register once.
Add detail when needed.

Start with the sign-in details already used for your company. HMRC explains when to use Government Gateway or GOV.UK One Login; use its recovery route if you have forgotten the details or cannot receive an access code. Your accountant or the person who manages your tax records may be able to supply the VAT number without you needing to regain access first.

A company number, VAT number and HMRC Unique Taxpayer Reference (UTR) are different identifiers. This form asks for the applicable company and VAT details, not your UTR or account credentials. You can search the public Companies House register without signing in.

• Check which HMRC sign-in details to use ↗ (opens in a new tab)HMRC

  Explains Government Gateway and GOV.UK One Login. Start here if you are unsure which account you already use.

• Recover access to HMRC online services ↗ (opens in a new tab)HMRC

  Help with forgotten sign-in details, access codes and problems getting into the right account.

Start with company and ownership references, an applicable modern-slavery statement, statutory employers’ liability evidence where required, and evidence for certifications you claim. Reference current records. Full accounts, policy manuals, site records and specialist security evidence are requested only when justified.

When the work needs additional terms or assurance: for example government information, an assigned defence cyber level, product security, controlled exports, specific quality or insurance requirements, processing personal data, subcontracting or overseas access. One addendum can cover several identified orders or activities.

No blanket certification requirement is created by initial registration. State what you hold. Requirements follow the actual activity and contract. FSC status and personnel assurance are verified separately through an authorised security route when required; do not disclose those details in the general form.

This is RCDEN’s purchasing requirement, including for relevant equipment used internally. Before order acceptance, RCDEN identifies the products, component depth, software, firmware and associated services covered, the prohibited connections and the evidence needed. A UK seller or finished-product country of origin alone is insufficient. Known restricted connections and unknown provenance must be declared and resolved before approval.

Read the relevant public policies for context. Additional contractual obligations must be expressly identified and supplied, with the relevant title, revision and clauses, in the accepted order or signed schedule. A general link to a changing website does not silently add terms. Applicable legal duties still apply.

Yes, for the same contracting legal entities. The standing terms apply to orders accepted during registration even if they are not repeated in each order. A separate accepted order or supply contract is still needed. Notify material changes and keep required evidence current. A different supplier legal entity needs a new registration.

Use a signed continuation with your supplier name, master reference and question number. List it in the evidence record and executed attachment set. Check digital entries remain visible before printing or signing. Use BLOCK CAPITALS if completing by hand.

Use the return route in 1.2. Ask your RCDEN contact for a suitable route before sending anything controlled. Facility clearance, personnel vetting, sensitive technical records and personal datasets do not belong in an ordinary registration email or on this website.

No. Read the PDF, accepted supply terms and signed addenda. The guide explains them; later website edits do not change the agreement. Registration and addendum signatures do not themselves authorise restricted work, disclosure, processing, transfer or subcontracting.