There's a bit of detail about the embargoed Pakistani F16's here.
http://www.f16falcon.com/facts/f16_17.html
In summary, it appears that they initially ordered 71. Twenty eight were built and placed in storage, whilst the remainder were never built. As best as I can tell the planes that went in to in storage remained fully intact and operational whilst diplomatic wrangling went on over whether they would be a) delivered to the PAF as ordered or b) the Pakistanis got their money back.
Circa 1995 it was proposed that they be sold to other countries, with the proceeds going to the Pakistanis. Initial suggestions were Taiwan (17 aircraft) and the Phillipines (11 aircraft), however that fell through as did a proposed deal with New Zealand and IRL the planes were still in Arizona as of sometime in 2001 (I don't know what state they're in now).
I think it is, therefore, possible that the PAF F16's might have found their way into Royal Air Force service in a T2K World. One possible stumbling block might be that it appears they were relatively older models (A/B's) so not state of the art, however the RAF might have decided that older model F16's were a better option than aging Phantom FGR2's. Personally, I'm quite sold on the idea...
(And I'm sure if the RAF didn't take them, then someone would have done in the months leading up to the Twilight War - perhaps New Zealand as originally planned).