Although i haven't come across the book but i did contact Sajjad Haider on his face book, however i still await a reply.
As for the engagement, India initially claimed to have shot down three F-86s but it later transpired into as one Gnat and two Sabres going down.
You should get it. I think shebazi or someone recommended and I got the book from Pakistan .
as per haider, chadhary claimed to have shot down a Gnat - perhaps to cover the shame of losing his wingmen. When he reached the base he could not explain convincningly the loss. moreover the gun camera film showed "not a bird in the sky" and it became a butt of jokes for the PAF in dacca. no one in the PAF believed the gnat claim at all. But hey a war was on and they had to publicise it for propaganda.
Haider also writes that Inamul Haq unwisely gave Chadhary some medal (SJ?) and that the rest of the pilots resented it.
When the full fledged war came, the CO did not fly any missions and instead decided to "man" the situation room, thus leaving all the flying to his No.2 man Dilawar.
After evactuation to peshawar, 14 sqn now on F-6s came under command of haider as the base commander. chadhary came to haider and asked to be posted out because the otehr pilots were making life hell for him. anticipating some kind of a riot/mutiny situation, haider posted chaudary out.
anyways that the PAF gnat claim for you.
on the indian side, all the four gnat pilots came back safe. their stories are told and have been told multiple times.