Form 8 (OPD) System C Healthcare

(a) Identity of the party to the offer making the disclosure:

McKesson Corporation

("McKesson")

(b) Owner or controller of interests and short positions disclosed, if different from 1(a):

The naming of nominee or vehicle companies is insufficient

Not applicable

(c) Name of offeror/offeree in relation to whose relevant securities this form relates:

Use a separate form for each party to the offer

System C Healthcare plc

("System C")

(d) Is the party to the offer making the disclosure the offeror or the offeree?

OFFEROR

(e) Date position held:

3 March 2011

(f) Has the party previously disclosed, or is it today disclosing, under the Code in respect of any other party to this offer?

NO

Class of relevant security:

1p ordinary

Interests

Short positions

Number

%

Number

%

(1) Relevant securities owned and/or controlled:

Nil

Nil

Nil

Nil

(2) Derivatives (other than options):

Nil

Nil

Nil

Nil

(3) Options and agreements to purchase/sell:

Nil

Nil

Nil

Nil

TOTAL:

Nil

Nil

Nil

Nil

Class of relevant security in relation to which subscription right exists:

None

Details, including nature of the rights concerned and relevant percentages:

None

Details of any irrevocable commitments or letters of intent procured by the party to the offer making the disclosure or any person acting in concert with it (see Note 3 on Rule 2.11 of the Code):

McKesson has received irrevocable undertakings from each of the System C directors (as set out below) in respect of their entire holdings in System C shares, representing approximately 4.29 per cent. of the existing issued ordinary share capital of System C

McKesson has also received irrevocable undertakings from Liontrust Asset Management plc ("Liontrust"), Gartmore Investment Management Limited ("Gartmore") from Guy Hands (as set out below) in respect of holdings or shares over which they have discretionary voting control, representing approximately 19.83 per cent. of the existing issued ordinary share capital of System C.

Finally, McKesson has received a letter of intent from BlackRock Investment Management (UK) Limited ("Blackrock") in respect of 10,656,454 System C ordinary shares in which they have discretionary voting control as at close of business on 1 March 2011, representing 9.2 per cent. of the existing issued ordinary share capital of System C.

In aggregate, McKesson has, therefore, received irrevocable undertakings and letters of intent to vote in favour of the Scheme in respect of 38,737,854 System C Shares, representing 33.28 per cent. of the existing issued ordinary share capital of System C.

Details of any interests, short positions and rights to subscribe of any person acting in concert with the party to the offer making the disclosure:

HSBC Bank plc

It was not practicable in the time available to have completed these enquiries. A further Opening Position Disclosure containing all relevant details will be made as soon as possible, and in any event before 12 noon the day falling 10 business days after this announcement.

Details of any indemnity or option arrangement, or any agreement or understanding, formal or informal, relating to relevant securities which may be an inducement to deal or refrain from dealing entered into by the party to the offer making the disclosure or any person acting in concert with it:

If there are no such agreements, arrangements or understandings, state "none"

None

Details of any agreement, arrangement or understanding, formal or informal, between the party to the offer making the disclosure, or any person acting in concert with it, and any other person relating to:

(i) the voting rights of any relevant securities under any option; or

(ii) the voting rights or future acquisition or disposal of any relevant securities to which any derivative is referenced:

If there are no such agreements, arrangements or understandings, state "none"

None

Supplemental Form 8 (Open Positions)

NO

Supplemental Form 8 (SBL)

NO

3 March 2011

Laureen Seegar

+1 (415) 983 8300