Bio-Rad Laboratories, Inc.

FORM 8.3

DEALINGS BY PERSONS WHO OWN OR CONTROL 1% OR MORE OF ANY CLASS OF
RELEVANT SECURITY

(Rule 8.3 of The City Code on Takeovers and Mergers)


Name of purchaser/vendor *                  Bio-Rad Laboratories, Inc.
------------------------------------------- --------------------------
Company dealt in                            Tepnel Life Sciences PLC
------------------------------------------- --------------------------
Relevant security dealt in                  Ordinary shares
------------------------------------------- --------------------------
If a connected EFM, name of offeree/offeror
 with which connected
------------------------------------------- --------------------------
If a connected EFM, nature of connection #
------------------------------------------- --------------------------
Date of dealing                             4 August, 2005
------------------------------------------- --------------------------


DEALINGS (a)

Amount bought                               Price per unit (currency
                                             must be stated)
------------------------------------------- --------------------------

------------------------------------------- --------------------------
Amount sold                                 Price per unit (currency
                                             must be stated)
------------------------------------------- --------------------------
100,000                                      7.75 pence/share
------------------------------------------- --------------------------



Resultant total amount and percentage of    4,530,000 ordinary shares
 the same relevant security owned or         (2.13% of the outstanding
 controlled                                  ordinary shares)
------------------------------------------- --------------------------


IS A SUPPLEMENTAL FORM 8 (DERIVATIVE)/FORM 8 (OPTION) ATTACHED? NO


Date of disclosure                          5 August, 2005
------------------------------------------- --------------------------
Contact name                                Tom Brida
------------------------------------------- --------------------------
Telephone number                            (510) 741-6345
------------------------------------------- --------------------------


* Specify the owner or controller in addition to the person dealing. The naming
of nominees or vehicle companies is insufficient. In the case of disclosure of
dealings by fund managers on behalf of discretionary clients, the clients need
not be named.

# See the definition of "connected fund managers and principal traders" in the
Definitions Section of the Code.

(a) If disclosing dealings/holdings in derivatives or options, please attach
Supplemental Form 8 (Derivative) or Supplemental Form 8 (Option), as
appropriate.

For details of the Code's dealing disclosure requirements, see Rule 8 and its
Notes which can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk.

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