EXHIBIT 15

To:  Lloyds TSB Bank plc.

l.   In  consideration  of your agreeing to grant or continuing to grant banking
     facilities to VTL (UK) Limited (hereinafter called the "Customer") upon the
     terms of the agreement  between you and the Customer  dated 21 October 2005
     (hereinafter  called the "Lloyds TSB  Facility")  we  guarantee  payment on
     demand upon us of

     (a)  all  principal  amounts  unpaid  by the  Customer  by the due date for
          payment in accordance with the Lloyds TSB Facility (hereinafter called
          the "Due Date") including, in the event of discontinuance by any means
          of this  guarantee  all  cheques  drawn by the  Customer  or any other
          written  commitments  of  indebtedness  entered  into by the  Customer
          purporting  to  be  dated  on or  before  the  date  upon  which  such
          discontinuance  becomes known to you although  presented to or paid by
          your Bank  after  the date  upon  which  such  discontinuance  becomes
          effective; and

     (b)  interest  on all such  principal  amounts to the date of demand  under
          this guarantee,  commission, fees and other banking charges, costs and
          expenses in accordance with the Lloyds TSB Facility.

     ALWAYS PROVIDED THAT

     the total amount  recoverable from us under this guarantee shall be limited
     to a sum of  (pound)6,000,000  and in addition the interest (on that amount
     or such less sum as may be due or owing) under Clause 3 hereof; and

2    Upon  receipt of any  demand  from you under  this  guarantee,  we shall be
     entitled  to repay the  aggregate  of all  drawings  and any  other  sum(s)
     outstanding  under  the  Lloyds  TSB  Facility  at the  time of the  demand
     whereupon the Lloyds TBS Facility shall terminate and you shall, upon being
     satisfied  that all  obligations  under the Lloyds TSB  Facility  have been
     fully and finally discharged,  return to us this guarantee having marked it
     as cancelled.

3.   We  additionally  agree to pay  interest  on any amount for which we may be
     liable  hereunder  at 2.0% per annum above your Base Rate from time to time
     in force from the date of demand on us for payment  until final  payment by
     us.

4.   This  guarantee  shall be a continuing  security  provided  always that our
     liability  hereunder shall expire upon the earlier of 30 March 2006 and the
     date on which all amounts  outstanding  under the Lloyds TSB Facility  have
     been repaid in full except in respect of any demand for payment received by
     us by letter or authenticated  cable/telex  message on or before that date.
     Each such demand made  hereunder  shall  incorporate  a statement  that the
     amount claimed by you represents:

     (i)  amount(s)  due to you from the  Customer  pursuant  to the  Lloyds TSB
          Facility and unpaid on the Due Date(s) therefor, and/or

     (ii) contingent  liabilities  of the  Customer  pursuant  to the Lloyds TSB
          Facility outstanding at the date of demand and which are not likely to
          be  determined  until  after  the  expiry of this  Guarantee  and that
          arrangements  satisfactory  to you have not been  made to  extend  the
          validity  of  this  Guarantee  or  provide  you  with  other  security
          acceptable to you.

5.   Any  amount  paid by us  hereunder  in  response  to a demand in respect of
     contingent  liabilities  of the Customer may be held by you as security for
     such  liabilities  and may be applied by you in or towards  satisfaction of
     all amounts owing to you in connection  therewith as soon as the same shall
     become due or at any time  thereafter.  You shall be under no obligation to
     return to us any amount received by you under this





     Guarantee and not applied in reduction of the  liabilities  of the Customer
     until all such liabilities  have been fully and finally  discharged to your
     satisfaction.

6.   Our liability  under this guarantee  shall not be affected by any variation
     in or  renewal  of  such  banking  facilities,  the  granting  of  time  or
     indulgence to or  composition  with the Customer,  any legal  disability or
     incapacity of the Customer,  any  moratorium or similar  enactment or other
     circumstance affecting in any way whatsoever the liability of the Customer,
     or any other matter or thing which might otherwise operate to discharge our
     liability as guarantor hereunder.

7.   If at any time, you receive or recover  payment after a Due Date in respect
     an amount which was unpaid by the Customer by the Due Date, then

     (a)  if you have made a demand of us in  respect of such  amount  which has
          not been paid by us, you shall  issue to us a  confirmation  that such
          demand is cancelled; and

     (b)  if we have made  payment to you under the terms of this  guarantee  in
          respect of such amount, you shall:

           (i)  hold such payment received or recovered in trust for us; and

           (ii) forthwith pay an amount equal to such payment to us.


8    You shall not assign or  transfer  any of our rights  under this  guarantee
     without our prior written consent.

9.   This guarantee  shall be governed and construed in accordance  with English
     law.

10.  You and we both  irrevocably  agree that the  courts of England  shall have
     jurisdiction to hear and determine any suit, action or proceedings,  and to
     settle  any  disputes,  which may arise out of or in  connection  with this
     guarantee and, for such purposes, you and we both irrevocably submit to the
     jurisdiction of such courts.


For and on behalf of


/s/ Thomas Doster
--------------------
Authorised Signatory



We hereby acknowledge and agree to these terms

For and on behalf of Lloyds TSB Bank plc.:


Authorised Signatory