Natwest Group PLC

Prospectus • Sep 8, 2009

SUPPLEMENTARY OFFERING MEMORANDUM DATED SEPTEMBER 8, 2009

The Royal Bank of Scotland Group plc

(Incorporated in Scotland with limited liability under the Companies Acts 1948 to 1980, registered number SC045551)

as Issuer and Guarantor

The Royal Bank of Scotland plc

(Incorporated in Scotland with limited liability under the Companies Acts 1948 to 1980, registered number SC090312)

as Issuer

U.S.\$35,000,000,000 Medium-Term Note Program Due Six Months or More From Date of Issue

This Supplement (the "Supplement") to the Offering Memorandum (the "Offering Memorandum") dated June 16, 2009, which comprises, except as set out therein, a base prospectus, constitutes a supplementary prospectus for the purposes of Section 87G of the Financial Services and Markets Act 2000 (the "FSMA") and is prepared in connection with the U.S.\$35,000,000,000 Medium-Term Note Program (the "Program") established by The Royal Bank of Scotland Group plc ("RBSG" or the "Guarantor") and The Royal Bank of Scotland plc ("RBS") (each, an "Issuer" and together, the "Issuers"). Terms defined in the Offering Memorandum have the same meaning when used in this Supplement.

This Supplement is supplemental to, and should be read in conjunction with, the Offering Memorandum and the documents incorporated by reference therein. This Supplement should also be read and construed in conjunction with the Supplementary Offering Memoranda dated August 14, 2009 and August 28, 2009 which have been previously published and have been approved by the Financial Services Authority (the "FSA") and filed with it and which form part of the Offering Memorandum.

Each of the Issuers and the Guarantor accepts responsibility for the information contained in this Supplement. To the best of the knowledge of each of the Issuers and the Guarantor (each having taken all reasonable care to ensure that such is the case) the information contained in this Supplement is in accordance with the facts and does not omit anything likely to affect the import of such information.

Incorporation of Information by Reference in the Offering Memorandum

The following documents, which have been (1) previously published and (2) approved by the FSA or filed with it shall be deemed to be incorporated in, and form part of, the Offering Memorandum:

• (a) the amendment to the RBSG Interim Results published by RBSG on August 14, 2009; and
• (b) the press release headed "Royal Bank of Scotland PLC Subordinated Debt Instruments" dated September 4, 2009 issued by RBSG.

A copy of any or all of the information which is incorporated by reference in the Offering Memorandum can be obtained from the website of RBSG at www.rbs.com and from the London Stock Exchange plc's website at www.londonstockexchange.com/en-gb/pricesnews/marketnews/.

If the documents which are incorporated by reference in the Offering Memorandum by virtue of this Supplement themselves incorporate any information or other documents therein, either expressly or implicitly, such information or other documents will not form part of the Offering Memorandum for the purposes of the Prospectus Directive except where such information or other documents are specifically incorporated by reference in, or attached to, the Offering Memorandum by virtue of this Supplement.

To the extent that there is any inconsistency between any statement in or incorporated by reference in the Offering Memorandum by virtue of this Supplement and any other statement in or incorporated by reference in the Offering Memorandum, the statements in or incorporated by reference in the Offering Memorandum by virtue of this Supplement will prevail.

Save as disclosed in this Supplement or in any document incorporated by reference in the Offering Memorandum by virtue of this Supplement, no other significant new factor, material mistake or inaccuracy relating to information included in the Offering Memorandum has arisen or been noted, as the case may be, since the publication of the Offering Memorandum.

Investors should be aware of their rights under Section 87Q(4) of the FSMA.