The book you are thinking of is 'Phoenix into Ashes' - now out of print.
There are many theories concerning the cancellation. Although the pro-navy biased thoughts of Mountbottom didn't help, perhaps the desire of the closet communists of the Wislon era to appease their Soviet masters was the key?
TSR2's 1000 mile radius design sortie with a 2000lb bomb load was a climb to just above 20000ft, a cruise at M0.92 for about 500nm, followed by a supersonic acceleration and climb at M1.7 to around 48000ft. Then a rapid descent at M1.7/600KIAS to ultra low level for a 200nm ingress at M0.9. After weapon release, it would egress at M0.9, then climb to around 30000ft at M0.9 and return at M0.92......
Which would have made a nuclear attack on Moscow and return to RAFG quite achievable, though very risky.
Alternatively, a 700 nm radius sortie could have been flown entirely at 200ft and M0.9 - sufficient to fly from RAFG to the Ukraine and back.