Exhibit 10.11

                         WHITE MOUNTAINS RE GROUP, LTD.
                                   ("WTM RE")
                          LONG TERM INCENTIVE UNIT PLAN
                                     SUMMARY

The purpose of the WTM Re Long Term Incentive Unit Plan (the "Plan") is to
provide long-term performance incentives for senior officers and other key
employees of the WTM Re companies and to align the interests of management with
those of White Mountains.

Participation in the Plan is discretionary based on annual recommendations by
WTM Re management as approved by the Board of Directors of WTM Re and its
subsidiaries. Performance achievement is measured over three consecutive year
periods. The first payout under the Plan will be in 2007. The final Plan
document is currently being drafted and will be approved by the Board of
Directors of the respective companies participating in the Plan. The Plan will
contain the following provisions:

UNIT AWARDS:
Participants are awarded Units with each Unit representing a value of $1,000.
There is the potential for the number of Units awarded to increase to a maximum
of 2 times the original award or decrease to zero depending upon the average
after-tax return on underwriting capital (as discussed below) over each three
year performance period. The ultimate value of each Unit is based upon the
consolidated results of the WTM Re.

MEASURING RETURNS:
The current performance target is a 13% after-tax return on underwriting capital
("UROC"). UROC is an amount of capital required to maintain the relevant rating
agency standard for each WTM Re entity. For example, the capital allocated to
Sirius International represents an amount of capital needed to maintain an "A"
level S&P rating.

The number of Units awarded will be reduced to zero at an average after-tax
return on UROC of 6% (the minimum return our owners expect on the capital) and
will be increased to a maximum of 2-times the original Unit award at an average
after-tax on UROC at or above 20%. The final dollar value of each Unit will also
be increased or decreased by the annual UROC compounded for each year in the
three-year cycle. The Board shall have the discretion to determine the standards
upon which the actual return on GAAP UROC are calculated including adjustments
to reflect standard investment income, internal and external debt interest, and
effective tax rates for each company within the group.