CPI and RPI line Items - December 2021 to April 2025

Summary

The requester asked for updated CPI and RPI line item indices from December 2021 to April 2025, along with specific weighting data. The Cabinet Office provided the index data but refused the weighting request under Section 20 of the Act, citing that the information was already reasonably accessible via a previous FOI response.

Key Facts

• The request covered CPI and RPI monthly indices from December 2021 to April 2025.
• Items 1 and 2 (monthly indices) were disclosed in an attached spreadsheet.
• Item 3 (weights for unlinked or chain-linked indices) was withheld.
• The authority cited Section 20 of the Freedom of Information Act 2015 for the partial exemption.
• The withheld weight data was previously released in FOI case 2216049 in February 2022.

Data Disclosed

• December 2021
• April 2025
• 22/02/2022
• 2 June 2025
• 19 June 2025
• 4701661
• 2216049
• Section 20
• 3 pages
• 1 document

Exemptions Cited

• Section 20 of the Freedom of Information Act 2015 (Information reasonably accessible)

Original Request

Dear Cabinet Office, You previously provided data on the line items for CPI and RPI in a Freedom of Information Request with outcome date 22/02/2022. This was very helpful, and I would like to request an update to this data. The data already provided was to December 2021. I am writing to request the same data continuing from the previous date of December 2021, to the latest currently available, which as of the time of writing would be April 2025. I have provided more detail on the items I am requesting below but if there is any confusion you can also review the previous FOI request I mentioned above as I am requesting the same information over a different time period. Item 1 - Monthly index for every line item used in the CPI calculation from December 2021 to April 2025 Item 2 - Monthly index for every line item used in the RPI calculation from December 2021 to April 2025 Item 3 - Weights for any dates at which either the CPI or RPI indices were unlinked or chain linked, for reweighting or otherwise.

Data Tables (1)

Full Response Text

Government Office Douglas Isle of Man IM1 3PN Telephone: (+44) 01624 686244
Website: www.gov.im/co

Our ref: 4701661 19 June 2025

Dear ###

We write further to your request, received 2 June 2025, which states:

"Dear Cabinet Office,

You previously provided data on the line items for CPI and RPI in a Freedom of Information Request with outcome date 22/02/2022. This was very helpful, and I would like to request an update to this data. The data already provided was to December 2021. I am writing to request the same data continuing from the previous date of December 2021, to the latest currently available, which as of the time of writing would be April 2025.

I have provided more detail on the items I am requesting below but if there is any confusion you can also review the previous FOI request I mentioned above as I am requesting the same information over a different time period.

Item 1 - Monthly index for every line item used in the CPI calculation from December 2021 to April 2025
Item 2 - Monthly index for every line item used in the RPI calculation from December 2021 to April 2025
Item 3 - Weights for any dates at which either the CPI or RPI indices were unlinked or chain linked, for reweighting or otherwise."

Our response to your request is as follows:

Item 1 - Monthly index for every line item used in the CPI calculation from December 2021 to April 2025
Item 2 - Monthly index for every line item used in the RPI calculation from December 2021 to April 2025

I have enclosed copies of the information requested items - attached spreadsheet: FOI 4701661 CPIRPI Indices.

Item 3 - Weights for any dates at which either the CPI or RPI indices were unlinked or chain linked, for reweighting or otherwise.

While our aim is to provide information whenever possible, under section 20 of the Act, we are not required to provide information in response to a request if it is already reasonably accessible to you, whether free of charge or on payment of a fee.

The information that you have requested is available online here at : FOI Request Search using the search term for Case ID: 2216049.
The RPI weights and CPI weights were previously provided in response to Freedom of Information request 2216049 in February 2022. Please quote the reference number 4701661 in any future communications.

Your right to request a review

If you are unhappy with this response to your freedom of information request, you may ask us to carry out an internal review of the response, by completing a complaint form and submitting it electronically or by delivery/post.

An electronic version of our complaint form can be found by going to our website at https://services.gov.im/freedom-of-information/Review . If you would like a paper version of our complaint form to be sent to you by post, please contact me and I will be happy to arrange for this. Your review request should explain why you are dissatisfied with this response, and should be made as soon as practicable. We will respond as soon as the review has been concluded.

If you are not satisfied with the result of the review, you then have the right to appeal to the Information Commissioner for a decision on; 1. Whether we have responded to your request for information in accordance with Part 2 of the Freedom of Information Act 2015; or 2. Whether we are justified in refusing to give you the information requested.
In response to an application for review, the Information Commissioner may, at any time, attempt to resolve a matter by negotiation, conciliation, mediation or another form of alternative dispute resolution and will have regard to any outcome of this in making any subsequent decision. More detailed information on your right to a review can be found on the Information Commissioner’s website at www.inforights.im. Should you have any queries concerning this letter, please do not hesitate to contact me. Further information about freedom of information requests can be found at www.gov.im/foi. I will now close your request as of this date.

Yours sincerely