I don't think the UK should be concerned about bunker busting once the HVPW materializes. Too big to fit in the F-35B internal weapons bay so it will be carried externally. A possible option for Typhoon as well.Good good, when it mentioned the type of carriage rather than just in general it just made me think.
One bit on the RAF site is that it says that the 500lb class Paveway IV will replace the 1000lb class Paveway II and Enhanced Paveway II. It looks as though we're going to lose the 2000lb Enhanced Paveway III (the 'bunker buster') capability with the loss of Tornado as we know the F35B can't carry them and I can't remember if Typhoon is down to carry them in the far future.
I know it's very much a specialised weapon and smaller yield weapons would by and large be more appropriate but like what happened in Libya, we had a brace of weapons like Brimstone and Paveway IV for when collatoral damage needs to be minimised but we still deployed EPWIII to attack hardened structures.
AFRL Moves Ahead on Bunker-Buster for F-35