The rules for this OID arc are given in British Standard BS 7453 Part 1: "UK registration for Open System Standards - Procedures for the UK Name Registration Authority".
The following are excerpts from BS 7453 Part 1:
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4.1.4: The following object identifier assigned to the UK scheme for the assignment of object identifiers names are available:
(a) the object identifier value (see BS ISO/IEC 8824) {iso member-body gb(826)}; [...].
4.1.5: The following object identifiers are available to the UK Name Registration Authority for the purpose of name assignment:
(a) the object identifier value, derived from item (a) of 4.1.4, {iso member-body gb(826) national(0)} [...];
(b) the object identifiers of localities, each formed by concatenating as a prefix the object identifier from 4.1.4 with one of the sequences of object identifier component values assigned to localities by the Registration Authority. The method by which the UK is divided into localities, and thus name values are assigned to those localities, is outlined in appendix C. [See also F.3 below]
NOTE. The named identified in (a) are used for the assignment of UK national names. The names identified in (b) are used for the assignment of UK local names. In effect, the UK Name Registration Authority acts as a name registration authority for each locality within the UK, divided as outlined in appendix C.
4.1.6: No restrictions are placed on the kinds of organizations that can be assigned object identifier components by the UK Name Registration Authority.
4.2.1: Object identifier component
For the purposes of UK name generation an object identifier component is a positive integer [strictly] greater than 0 and [strictly] less than 224, i.e. 16,777,216). [...]
6.1.1.1: An organization that is registered as a company under the provisions of the Companies Act 1985 is deemed to be assigned the implicit object identifier [...] formed in accordance with 6.1.1.2[...].
6.1.1.2: The implicit object identifier for a UK registered company is formed in two stages. First, a pair of component values is formed, by taking the integer value of the numeric component of the registered number and concatenating as a prefix one of the following object identifier component values:
(a) 1: for companies registered in England and Wales;
(b) 2: for companies registered in Scotland;
(c) 3: for companies registered in Northern Ireland.
Second, the resultant component pair is prefixed with the object identifier for the UK Name Registration Authority (see item (a) of 4.1.5).
6.2.2.3: An organisation can only register a name value ending in the four characters <spacem, assigned by the UK Name Registration Authority, in accordance with the procedures described in 6.4.1.1, will be used as the last component of the OSI name, and will succeed one of the sets of object identifier components assigned to the localities specified by the UK Name Registration Authority (see appendix C). {iso member-body gb(826) L...Lorganization(m)} [where L...L is associated with one the localities defined in appendix C)]
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iso(1)
national(0)
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