--------------------- CUSIP No. 902900109 13G Page 7 of 8 Pages ----------------------- --------------------- EXHIBIT 1 TO SCHEDULE 13G

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CUSIP No.   000000000               13G                    Page  7 of  8 Pages
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                        EXHIBIT  1  TO  SCHEDULE  13G


                              February 14, 1997



           XXXXXX XXXXXXX GROUP INC. and XXXXXX XXXXXXX ASSET MANAGEMENT LIMITED

         hereby agree that, unless differentiated, this Schedule 13G is filed
         on behalf of each of the parties.

         XXXXXX XXXXXXX ASSET MANAGEMENT  LIMITED



BY:      /s/ XXXXX X. XXXXXX
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         Xxxxxx Xxxxxxx Asset Management Limited
         Xxxxx X. Xxxxxx/Director Xxxxxx Xxxxxxx Asset Management Limited



         XXXXXX XXXXXXX GROUP INC.

BY:      /s/ XXXXXX X. XXXXXXX
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         Xxxxxx Xxxxxxx Group Inc.
         Xxxxxx X. Xxxxxxx/ Vice President Xxxxxx Xxxxxxx & Co., Incorporated