“16. ... While senior lenders may have other remedies for redressal of an asserted loss on account of the action of NHAI, the Court in the present cause is concerned only with the question of whether a writ would issue based upon the express terms of the Concession Agreement. That question, for reasons aforenoted, must necessarily be answered in the negative. This Court is of the considered opinion that for sustaining the instant writ petition, it was imperative for the petitioners to have established that the agreements conferred a positive right upon them to seek extension of the Concession Agreement. The right to seek extension of that period flowing from Articles 29, 34 and 35 stands invested in the Concessionaire alone. Absent such a clause or conferment of a corresponding right in the lenders, the Court is left with no option but to hold that they cannot seek issuance of a writ for extension of the concession period.”