Not entirely true mate. We've tested atleast one low yield (sub kiloton) Pu device. Currently our programme is more diverse, we're forwarding with Pu based designs instead of HEU.Indian bombs where plutonium based, while Pakistan was Uranium based. While India attained more yields than Pakistan. OK!!!!lol
When we initiated our Nuclear Programme under Z.A. Bhutto, it was based on Pu.
Since Dr. A.Q. Khan was a metallurgist working for Urenco (Alemelo, The Netherlands) at that time his expertise was in HEU so we changed course but Pu programme was never terminated.