One requirement: "The NHS confirms that it cannot provide the treatments or equivalent, in a medically acceptable timeframe, for the patient’s condition/diagnosis (referred to as Undue Delay)"
That may be their get-out, if they argue that from the point of referral for surgery to a surgery date is only months - catch is, for NHS GRS, you must be referred by a GIC, taking around two years to get to that point.
Time to research possible venues & surgeons. =:D