It was a gap which was always going to happen, the facts were that 2018 was the projected and the rumour was that maybe it'd stretch to 2022.
QE starts builders sea trials in August 2016, helicopter flight trials in 2017 and F-35B flight trials at the end of 2018 (although there'll only be 4 in the UK by then).
Taking that into account, if the SHTF then the amount of paperwork needing to declare IOC could be rapidly reduced and an LPH capability (by far in excess of what Ocean could do) could be ready in that timeline. I'm not worried about it.
As for Type 26, I just laughed. Personally hoping that they go with a T-26-lite design.
A bunch of text from a magazine article:
RULING THE WAVES AGAIN Dec 2015 Tim Ripley
"...In mid-2018, HMS Queen Elizabeth is to set sail across the Atlantic to conduct F-35B integration trials off the US east coast. The joint US/UK F-35B Integrated Task Force has already carried out the initial stage of these tests at Naval Air Station Patuxent River, Maryland, including live take-offs from a ski jump built at the edge of the airfield’s runway. US Navy carriers do not have ski jumps and the UK is funding and conducting this part of the programme itself.
There has been considerable controversy over whether the first F-35B to land on HMS Queen Elizabeth will be a British aircraft flown by a British pilot. The MOD has recognised the symbolic significance of the moment and a UK aircraft will undoubtedly line up to fly this symbolic mission, with a ‘Brit’ at the controls.
The later phases of F-35B integration trials, however, will be fully multinational, with US Marine Corps aircraft and pilots playing a full role since the UK’s first operational F-35B unit, the RAF’s 617 Squadron, will not be fully up and running. Once the famous ‘Dambusters’ have fully converted to the F-35B during 2018 and achieved Initial Operating Capability (Land) at RAF Marham, Norfolk, the unit will prepare for full operational trials in HMS Queen Elizabeth.
This phase of the carrier’s entry to service will take place in UK waters during 2019; it will involve mass take-offs and landings, live ordnance drops and onboard maintenance. This is considered the critical test of the carrier programme and will pave the way for the declaration of Initial Operating Capability (Sea) in 2020, when at least nine F-35Bs will be available to embark on HMS Queen Elizabeth. Full operating capability is targeted for 2022, when the Crowsnest system will be in use and the second UK F-35B unit, 809 Naval Air Squadron, will be fully established."
Air Forces Monthly Magazine December 2015