1. "Punchy" Home Defence Force ie minimum Air Land & Sea Forces with
2. Strong SF/INT incl. MI6/MI5/Special Branch etc ie Counter Terrorist units +
3. Token but VERY able UN/NATO/EU Deployable Forces eg similar to 16 Air Assault/3 Cdo Bde
And a realisation - and willingness - by the UK - specifically Air Officers, General Staff & Admirals, the public and politicians that the sun long ago set on the Empire.