If '1 - cover excludes all catastrophic guarantees' is selected then no other numbers should be entered by the firm in the string (IR.30.03, Bank of England rule IR_bv3010_02)

The rule in plain words

What to do if your return fails it

1. 01Open the table below and find the cells the rule reads.
2. 02Compare the code or text in your return with the format the rule sets out, character by character, including any prefix and any spaces.
3. 03It runs only when your filing indicators mark IR.30.03 as reported.
4. 04This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Which returns it applies to

Line4 Check runs it on annual solo (ARS) and annual third-country branch (ARB) returns on Bank of England taxonomy 2.2.0. The Bank of England applies it to annual third-country branch (ARB) and annual solo (ARS) returns, as a blocking check.

The Bank’s own words and formula

The plain words above are the Bank of England’s own, word for word, from its list of validations.

Other rules on Non-life outwards reinsurance contract information (IR.30.03)

Every Solvency UK rule on IR.30.03

Checks like this one, run at the point of submission, are the first step to real-time supervision. Line4 builds SupTech software for financial regulators that runs checks like these as each return arrives.