28 Prima facie, there appears to be some force in that. As has been seen, the Financial Support Agreement was alleged to be limited in operation to the financial year 1 May 2001 to 30 April 2002. Yet, although the particulars relied on in support of that alleged agreement included the 1994, 1997, 1999 and 2000 letters of support,[10] none of the letters of support (except for the 2001 letter of support, which was not relied upon) provided for anything to be done during financial year 1 May 2001 to 30 April 2002. The judge found, however, that the letters of support [by which, presumably, his Honour meant each of the 1994, 1997, 1999 and 2000 letters of support] 'contained the essential terms of an agreement between Atco and Newtronics'. Consequently, the judge's conclusion implies the existence of a synallagmatic agreement covering the entire period 1994 to 2000 (if not also 2000 to 2001). In our view, it cannot realistically be supposed that Atco and Newtronics intended to bind themselves to an agreement of such unlimited or indeterminate duration.