The 14-1 victor was ridden by Derek Fox, who was only passed fit to ride in the race on Wednesday, winning on his first-ever National ride.
One for Arthur jumped so jolly well, apparently loving every minute of his four mile journey, shaking Cause of Causes 16-1 by 4.5 lengths, with Saint Are, third at 25-1.
One For Arthur gave Scotland only its second ever win in the Randox Health Grand National at Aintree today (8 April) for trainer Lucinda Russell. It's the best feeling I've ever had.
The eight-year-old horse is trained by the partner of Peter Scudamore, a former eight-time champion jockey who never won the grueling race in 12 attempts in the saddle.
Success for Russell's runner would give Scotland only their second win in the race after Rubstic's victory in 1979.
The 14-1 shot saw off the other 39 runners and riders having been one of the dark-horses for the race having finished strongly in the Becher Chase in December before winning comfortably at Warwick. "I can't quite believe it". "Without them I wouldn't have got back in time and I wouldn't have been as fit as I am".More news: Syrian chemical attack victim hits out CNN journalist
Russell is only the fourth woman to train a National victor, after Jenny Pitman, Venetia Williams, and Sue Smith.
The word "team" is heard nearly as much as "Arthur" (as everyone calls him), and Russell stresses how important that ethos is, saying: "I'm getting all this publicity and I've got a nice new jacket that says winning trainer on it".
"He's wonderful. He's improved every time".
He is jointly owned by a duo known as "the golf widows", Belinda McClung from the Scottish Borders and Debs Thomson from East Lothian. We have a fantastic team behind us and I'm just so pleased. Based on the research, it is the most likely horse to win the National, giving you a nice win at odds of 33-1 to re-invest in tomorrow night's Lotto draw, where with Lottoland, you can uniquely double the current jackpot from €7M to €14M! It's been an absolutely unbelievable day. He credited rehabilitation centre Jack Berry House for helping him get back into the saddle so quickly. Arthur just cruised that race, Derek rode so well and I'm just a bit lost for words really.
"That was wonderful, I'm tearful but it is fantastic", said Russell. "We've got some fantastic people here".