A 1970s Commonwealth battlecruiser would sell nuclear power and status

How would you design a mid-1970s Royal Navy battlecruiser that could also be sold to Commonwealth navies?

Make it a heavily equipped nuclear ship and market it as carrier-level prestige for less than a carrier budget.

A battlecruiser-sized design would use nuclear power and carry as much capability as the hull could support. This reflects the period's enthusiasm for nuclear propulsion. The sales case would promise carrier-like status at a smaller budget, with prestige compared to Nimitz or Enterprise. Capital-ship proposals often rely on this kind of political marketing as well as military capability.