Europe & Middle East Abu Dhabi Almaty Amsterdam Antwerp Bahrain Baku Barcelona Berlin Brussels Budapest Cairo Doha Dusseldorf Frankfurt / Main Geneva Istanbul Kyiv London Luxembourg Madrid Milan Moscow Munich Paris Prague Riyadh Rome St. Petersburg Stockholm Vienna Warsaw Zurich North & South America Bogota Brasilia* Buenos Aires Caracas Chicago Dallas Guadalajara Houston Juarez Mexico City Miami Monterrey New York Palo Alto Porto Alegre* Rio de Janeiro* San Diego San Francisco Santiago Sao Paulo* Tijuana Toronto Valencia Washington, DC * Associated Firm | | 19 October 2012 39216509-000004/1212734/PHS/WEB Re: Willis Netherlands Holdings B.V. Dear Sirs, In our capacity as Dutch legal counsel (advocaten) to Willis Group Holdings Public Limited Company, we have been asked to render an opinion on matters of Dutch law in relation to Willis Netherlands Holdings B.V., a private limited liability company (besloten vennootschap met beperkte aansprakelijkheid) incorporated under the laws of the Netherlands, having its corporate seat (statutaire zetel) in Amsterdam, the Netherlands, with address Hoogoorddreef 60, 1101 BE Amsterdam Zuidoost, the Netherlands (the “Company”), in connection with a Form S-3 Registration Statement dated 19 October 2012 signed by the Company, Willis Group Holdings Public Limited Company, Willis Investment UK Holdings Limited, Ta I Limited, Trinity Acquisition Plc., Willis Group Limited and Willis North America Inc. in connection with the offer, sale and issuance of securities from time to time (the “Registration Statement”); For the purposes of this opinion, we have examined, and relied with your consent solely upon, originals or electronic copies of the documents as listed below, but not any documents or agreements cross-referred to in any such document: a) a scanned copy, received by e-mail, of the executed Registration Statement; b) a scanned copy, received by e-mail, of the written resolutions of the board of managing directors (bestuur) of the Company, dated 16 October 2012, inter alia, authorising the execution by the Company of the Documents (the “Board Resolution”) containing among others a power of attorney granted by the Company authorising Adam Rosman, Joseph J. Plumeri, Micheal K. Neborak, Nicole Napolitano (all employees of Willis North America Inc.) and each managing director of the Company, acting individually to execute and deliver the Opinion Document (as defined below) and do all such acts as may be ancillary thereto on behalf of the Company (the “Power of Attorney”); |