Aircraft delivery of nukes is cheaper and better for tactical application (easier to disguise the nuclear capability of the strike). But they are far more vulne

Aircraft delivery of nukes is cheaper and better for tactical application (easier to disguise the nuclear capability of the strike). But they are far more vulnerable to interdiction and counter-force strikes. I suspect the UK's reliance on SLBM's is due to the size of the UK which makes finding sites for launch facilities difficult, and would expose their civilian population to too much risk from counter-force strikes (they were going to get nuked a lot already to knock out their airfields and harbors).