Holding(s) in Company

Halma PLC
18 May 2006


                              HALMA p.l.c.

           INTEREST NOTIFIED UNDER SECTION 198 COMPANIES ACT 1985


Halma p.l.c. received the following notification on 18 May 2006 from Silchester
International Investors Limited.

Silchester International Investors Limited ('Silchester') acts as an Investment
Manager for a number of commingled funds (its 'Clients').  In acting for its
Clients, Silchester are given full discretion over their investments, and are
empowered to vote on their behalf.  However, Silchester do not act as their
Custodian, and therefore shares are not held in the name of Silchester, but in
the nominee name of its Clients' Custodian bank.

In addition, Silchester holds 49.9% of the issued share capital of Sanderson
Asset Management Limited (' Sanderson'), a UK limited company that also acts as
an Investment Manager for a number of commingled funds and separate accounts. 
In acting for its clients, Sanderson are given full discretion over their
investments, and are empowered to vote on their behalf.  However, Sanderson do
not act as its clients' Custodian and therefore shares are not held in
Sanderson's name, but in the nominee name of Sanderson's clients' Custodian
bank.

Silchester's share ownership in Sanderson does not allow Silchester to exercise
any direct or indirect control over Sanderson's investment strategy, philosophy
or implementation, the investments that Sanderson may purchase or sell on behalf
of its clients, or the manner in which Sanderson may vote proxies that arise
from its client investments.  However, Silchester is deemed to have an
'interest' in shares that Sanderson controls by virtue of Section 203(2)(b) of
the Companies Act 1985.

Recent purchases/sales of shares in Halma p.l.c. by Silchester, on behalf of its
clients, have resulted in Silchester having an interest in the following shares
(also see below):

SILCHESTER                             49,720,278

Recent purchases/sales of shares in Halma p.l.c. by Sanderson, on behalf of its
clients, have resulted in Sanderson having an interest in the following shares,
and Silchester having an interest over the same shares for the purposes of
Section 203(2)(b) of the Companies Act 1985 (also see below):

SANDERSON                              12,876,000

Silchester's records show that Halma p.l.c. have the following shares in that
class:

HALMA p.l.c.                           369,179,280

As such, Silchester has an interest over 16.96% of the shares of that class and,
of that,   two of Silchester's clients control 8.67% and 3.67%.  This interest
is being notified in fulfillment of the obligations imposed by Sections 198-202
of the Companies Act 1985. Silchester does not have an interest mentioned in
Section 208(5) of the Companies Act 1985 in any of the shares to which this
notification relates.


Registered holder(s) and the number of shares held by each of them:

Share Class:      Ordinary

Issued Shares:  369,179,280


Silchester International Investors Limited

Client ownership:  49,720,278

% of Shares:         13.47%


Silchester Account                   Nominee                   Silchester  Silchester current % holding at
                                                                   voting        shareholding fund level
                                                                authority

Silchester International Investors   Northern Trust Co                Yes          13,540,837          3.67
International Value Equity Group
Trust

Silchester International Investors   Northern Trust Co                Yes           2,163,757          0.59
Tobacco Free International Value
Equity Trust

Silchester International Investors   Northern Trust Co                Yes          32,005,180          8.67
International Value Equity Trust

The Calleva Trust                    Northern Trust Co                Yes           2,010,504          0.54

                                     Total                                         49,720,278



Sanderson Asset Management Limited

Sanderson Asset Management client ownership:  12,876,000

% of Shares:    3.49%


Sanderson Account                    Nominee                    Sanderson   Sanderson current % holding at
                                                                   voting        shareholding fund level
                                                                authority

BUST                                 Northern Trust Co                Yes           5,631,000          1.53
CAT                                  Pictet & Cie                     Yes             274,000          0.07
DYN                                  State Street                     Yes             228,000          0.06
EUF                                  State Street                     Yes             730,000          0.20
GOLF                                 Bank of New York                 Yes             198,000          0.05
GRIT                                 Northern Trust Co                Yes           1,553,000          0.42
INGOT                                Mellon Trust                     Yes             352,000          0.10
MINI                                 State Street                     Yes             613,000          0.17
OCEAN                                Northern Trust Co                Yes             320,000          0.09
OVAL                                 Mellon Trust                     Yes             324,400          0.09
PEARL                                Northern Trust Co                Yes             109,000          0.03
RAIN                                 Citigroup                        Yes             278,000          0.08
STAMP                                Northern Trust Co                Yes             191,000          0.05
TIME                                 Bank of New York                 Yes              74,000          0.02
TRAY                                 Northern Trust Co                Yes           1,109,600          0.30
WHEAT                                Mellon Trust                     Yes             361,000          0.10
WINDY                                Northern Trust Co                Yes             253,000          0.07
WOGAN                                Northern Trust Co                Yes             277,000          0.08

                                                      Total                        12,876,000


Contact for further information:               Carol Chesney
                                               Company Secretary, Halma p.l.c
                                               Tel: [phone]


A copy of this announcement, together with other information about Halma, may be 
viewed on its web site www.halma.com




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