It was too expensive. We didn't need it. Labour took over a set of books that were totally unbalanced.
Please remember the TSR had, like all defence equipment, to be paid from the taxpayers purse.
In the early into mid into late 1960s.!!.....
Most people had outside toilets, no central heating, no bank account, were still paying off WW2... and on and on. We were too poor.
And in the final analacist, er... we didn't need it. History proved that.
Healey and Callaghan and Wilson were right.