One For Arthur won the 2017 Grand National becoming just the second Scottish-trained winner in the famous old race's long history.
Jockey Derek Fox guided him home for trainer Lucinda Russell easing him over the last and racing clear to take the victory in the world's most famous steeplechase.
Cause of Causes came in second with Saint Are third in a thrilling finish at Aintree with long-time leader Blaklion coming home fourth.
Despite jumping into Blaklion at the second-last fence, the 14-1 shot was spring-heeled at the final obstacle of the extended four-and-a-quarter-mile test.
Responding to everything asked of him by Fox, he galloped on resolutely to keep Cause Of Causes at bay and clinch the victory, emulating Rubstic in 1979.
Fox, who only returned to action from injury earlier in the week, said: "It's unbelievable. I can't believe it. He just jumped so well, even though he was a long way back. He never missed a fence, within reason. He was unbelievable.
"I was lucky to get back in time - I want to thank Jack Berry House. Without them I wouldn't have got back in time and I wouldn't have been as fit as I am."
A visibly elated Russell, whose partner and assistant is former champion jockey Peter Scudamore, said: "What a day! We have a fantastic team behind us and I'm just so pleased.
"He's amazing. He's improved very time. I kept thinking barring accidents, he would win the National and he has!
"Together (Peter and I) we have had good and bad times but the horses are all back in form now.
"It's brilliant for Scotland. I said it's for Scotland, but it's really for the team and the yard. It's out of this world."
2017 Randox Health Grand National - where they finished:
1st ONE FOR ARTHUR 14-1
2nd Cause Of Causes 16-1 4 1/2 lengths
3rd Saint Are 25-1 3 3/4 lengths
4th Blaklion 8-1 favourite 1/2 length
5th Gas Line Boy
6th Vieux Lion Rouge
7th Lord Windermere
8th Regal Encore
9th Pleasant Company
10th Houblon Des Obeaux
12th Le Mercurey
14th Just A Par
15th La Vaticane
16th The Last Samuri
17th Tenor Nivernais
18th Roi Des Francs
19th Wonderful Charm