So how can he best 'find a way' to fly on for a real big trip ?
Best will be to assure that he is well (medically fit to fly), then to assure his aircraft is entirely airworthy, then to assure that all the prerequisites are in place for the trip he intends. Anything less than that would not be best.
Rather than going around in circles in disputes the UK, that may mean even more disputes that escalate,
I know nothing of his affairs in the UK, though I expect that if there are disputes, that means that there is another party, who may have credible claims against Mr. Kirk. In fairness, such claims should be heard.