By Susan Newton & Georgia Diebelius A dad tragically passed away on his ‘holiday of a lifetime’ to Australia, just days before he was set to marry his long-term partner. Jeff Walker was on the trip with his fiancee, Donna Jones and her 14 year old son Aaron when he suddenly fell ill. The couple had been engaged for six years and were planning to get married while visiting friends in Australia. They started their journey from Manchester Airport on December 18, spending three days in Dubai before heading to Australia, but Jeff became unwell on the plane. Jeff collapsed near the plane toilets and…