Shareholder centre

Yes. Sign in or register at Investor Centre. Once logged in, to add your email address select "Update my details" followed by the option "Communications options". Then follow the onscreen instructions.

If you have registered for the online service provided by Computershare you can amend your address online. Otherwise you will need to complete a change of address form or write a letter to the registrars which should include the following:

• Your name in full, as it appears on your share certificate(s)

• Your previous address

• Your new address

• Your shareholder account number

This letter must be signed. For security reasons the registrars cannot accept address changes over the telephone.

You will need to complete a change of name form or write a letter to the registrars which should include the following:

• Your old name in full, as it appears on your share certificate(s)

• Your new name

• A copy of any legal documentation, such as marriage certificate, or deed poll

This letter must be signed. For security reasons the registrars cannot accept name changes over the telephone or online.

Please notify the registrars as soon as possible. For detailed information, visit the FAQ section of the registrars’ website.

Diploma is legally obliged to make its share register publicly available – some shareholders may receive unsolicited mail and/or calls.

UK investors have received unsolicited phone calls or correspondence concerning investment matters which imply a connection to their investments. These are typically from overseas based "brokers" who target UK shareholders offering to sell them what often turn out to be worthless or high-risk shares in US or UK investments. They can be very persistent and extremely persuasive and a 2006 survey by the Financial Conduct Authority (FCA) has reported that the average amount lost by investors is around £20,000.

It's not just the novice investor that has been duped in this way – many victims have been successfully investing for several years.

Be very wary of any unsolicited advice, offers to buy shares at a discount or offers of free reports into Diploma plc

If you receive any unsolicited investment advice:

• Make sure you get the correct name of the person and organisation and make a record of any other information they give you, e.g. telephone number, address, etc.

• Check that they are properly authorised by the FCA before getting involved. You can check at register.fca.org.uk/s/.

• The FCA also maintains on its website a list of unauthorised overseas firms which are targeting, or have targeted, UK investors and any approach from such organisations should be reported to the FCA so that this list can be kept up to date and any other appropriate action can be considered. If you deal with an unauthorised firm, you would not be eligible to receive payment under the Financial Services Compensation Scheme. The FCA can be contacted by completing an online form at www.fca.org.uk/about/how-we-regulate/enforcement or by calling 0845 606 1234.

• Inform our registrars on 0870 707 1606. They are not able to investigate such incidents themselves but will record the details and pass them on to Diploma and liaise with the FCA.

More detailed information on this or similar activity can be found on the FCA website.

If you want to transfer your shares to someone that you know, you can transfer your holding using a stock transfer form. Please download and complete the stock transfer form.

You should notify Computershare, either in writing or by telephone, so a restriction can be placed on your certificate in case of any attempted fraud. You will be sent a letter of indemnity to complete and return for a replacement certificate. There is a charge for this service. For more information visit the registrars’ website.

For UK Capital Gains Tax purposes, the 31 March 1982 value for ordinary shares held at 31 March 1982 was 23.42p. If you require assistance with your Capital Gains Tax calculations, please contact your professional adviser or accountant.

If you have any other enquiry about Diploma’s business or about something affecting you as a shareholder (other than questions dealt with by Computershare), contact investors@diplomaplc.com.

You can check your shareholding details using this online facility.

Shareholders can also download and print "change of registered address" and "stock transfer" forms from Computershare’s website.