You need more than a brave safety pilot; you need an instructor/examiner to revalidate your PPL(H) and type-rating via an LPC.
Once you have your PPL revalidated, you can enrol with a groundschool (Bristol, CAPT) for the ATPL(H) exams (or CPL exams if that's the route you'd prefer), hour-build and study, then CPL flying course once you've got the 155 hours.
Cheers
Whirls