It was shortly before 2pm on a quiet Saturday when the emergency call came through.

It was the Easter weekend, in April last year, and a small Piper Cherokee plane had gone off radar.

In it was engineer David Rous, 28, and his wife Margaret Ann, a 37-year-old doctor of Newport-on-Tay, who were flying from Dundee to spend a weekend holiday with family on Tiree.

The most westerly island in the Inner Hebrides of Scotland, it was where David and Margaret had met seven years before. She had been to school there and knew it well.

The couple, described as "perfect angels" by Margaret Ann's colleagues were en-route to see her sister when their aircraft disappeared.

A huge air, land and sea search was launched. Among them was the Oban Mountain Rescue Team.

"They tried so hard to find them," says George Bruce, Margaret Ann's brother-in-law.

"Some people had to make really difficult phone calls to us to update us on what they had found and it must have been really hard."

The group searched the shores of Loch Etive where they had almost perfect visibility.

But the rescue helicopters, circling above, struggled with the low lying clouds, suspended like a grey blanket down to 100 metres.

It was way down on a remote hillside at Beinn Nan Lus, after six hours of searching, that the team finally found the crash site.

The mountain rescue helicopters flew up as high as they possibly could and dropped them on the hill to walk to the plane.

"They had to walk hours to get to the crash site," says George. "The Salvation Army put on food for them. So many people tried to help that day."

Tragically, the couple they had fought so hard to get to, could not be saved.

Tributes flooded in for Margaret Ann described as a woman who "touched the hearts of everyone" and for David, a really nice man who had a "bright professional career ahead of him".

And later, tributes came in too for those who had fought so hard to reach them.

"They did such an incredible job that day and I have thought about raising money for them for some time now," says George.

"We have obviously been grieving for Margaret-Ann and David, but now I feel ready to do this.

"This has been a very difficult time for the family and we are still all very raw, but we really want to repay the mountain rescue team members for everything they did."

The team spent many hours working in very harsh conditions which were extremely demanding, both physically and mentally, in order to bring David and Margaret Ann home.

"It is quite humbling to know that there are people who are prepared to give up their time for complete strangers to reunite families with their loved ones," says George. "It meant a great deal to us."

In order to thank the rescue teams for all their efforts to reach their loved ones, George is being supported by the couple's family to undertake a trek from the island of Tiree to Margaret Ann and David's home near Dundee.

"My son is superhero daft and he suggested I do it dressed as Batman," says George.

"The mountain rescue team will be there to see me off at Oban ferry terminal and I'm going to walk the 124 miles from there to Dundee."

George's son, three-year-old Jackson, has been helping him train and for extra support, the family's pet cockapoo, Strummer, will be by his side - aptly dressed as Robin.

"He's got a wee Robin outfit, he loves it. He's training with me, he can do about 25 mile and then I pick him up," says George.

"My mother is going to be there with the car to keep an eye on me and one of the hotels has donated a room for me which is so kind," he adds.

And friends of Margaret Ann and David have also been in touch to offer to walk with George along various parts of the journey.

"Everyone has been so kind and I'm hopeful we can raise vital funds for the rescue team," he says.

"They are a big charity but they need money for new equipment. What they do is so important."

The walk will take place in November, with George hoping to arrive in Dundee on November 24, which would have been Margaret-Ann's 39th birthday.

George has already surpassed his £1000 fundraising target before he has even set off, though he hopes to raise even more.

Members of Oban Mountain Rescue have paid tribute to his mission to support them and to the young couple they tried to save.

"Your support is very special to us and the money raised will greatly help our search and rescue service in the mountains and within the wider community in which we feel privileged to play a part."