> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-plus-islands/addressbase-plus-islands-downloads.md).

# AddressBase Plus Islands Downloads

{% hint style="info" %}

### Product download

This page provides downloadable files to support the product in use. To download the product itself, please visit the [OS Data Hub](https://osdatahub.os.uk/data).
{% endhint %}

## Classification scheme

The product classification scheme is available to download as a zip file (in CSV and .xlsx formats) from the [classification scheme page](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/classification-scheme.md) in the AddressBase Fundamentals section.

## Header files

The header files for AddressBase Plus Islands are available for download as a CSV file:

{% file src="/files/vQwdOpifZkmV53z1kuqM" %}

## Local custodian codes

Local custodian codes for the product are available to download as a zip file (in CSV format) from the [AddressBase Islands local custodian codes page](/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/addressbase-islands-local-custodian-codes.md) in the AddressBase Fundamentals section.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-plus-islands/addressbase-plus-islands-downloads.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
