We are up and running in the day's third race and the field has been strung out early with some hot pace from Alisier D'irlande. Favourite Douvan is tracking faithfully.

Frank Keogh
BBC Sport at Aintree

Retired champion jockey AP McCoy will not have a ride in the Grand National for the first time in 20 years.

"I'm jealous of all the other riders," McCoy tells BBC World Service.

You can listen to the full interview, and more from jockeys Leighton Aspell and Katie Walsh, during the Sportsworld programme from Aintree between 1500 and 1600 BST.

Image source, BBC Sport

Next on the card is the Maghull Novices' Chase. After his win with Yorkhill in the last race, trainer Willie Mullins has another white-hot favourite.

Douvan offers only the skinniest value at 1-6 after winning at Cheltenham.

French raider Alisier D'irlande might offer the stiffest competition, but I wouldn't hold your breath.

Three-time winner Red Rum's final resting place is just past the Aintree finishing post.

And a regular stream of racegoers are paying him a visit and paying their respects.

Image source, Getty Images

Cornelius Lysaght
BBC horse racing correspondent

1. The Last Samuri 2. Many Clouds 3. O'Faolains Boy 4. Saint Are

"Very well handicapped, The Last Samuri was very impressive when winning at Doncaster last time. Has enjoyed a perfect preparation."

More tips here

Image source, Getty

The Romford Pele?

Social Media Disaster?

Zayn Malik's Overnight Bag?

Are they among the big-race outsiders? Or figaments of our feverish imagination?

Take this BBC Sport quiz and see if you can spot the Grand National runners from the ringers.

And, yes, there are a couple of doozies from Alan Partridge, external thrown into the mix for you as well. 

Image source, Reuters

We are also after your photos of your Grand National day.

Got a favourite hiding spot for your betting slip?

Sporting your fancy's colours in spiritual support?

Perhaps you have let the kids loose on the racecard to decide where your money goes?

Hit us with your snaps on #bbcracing, external on Twitter.

Image source, Getty Images

In their Liverpool pomp Robbie Fowler and Steve McManaman bought two racehorses, calling them Some Horse and Another Horse, just for the amusement of hearing a commentator call their challenge for the lead.

Not sure either of those will make the cut, but we are after your favourite horse names from the sport's history today. 

Whether it was a personal connection that made sure they always carried your cash, a pun that made you grin or just something that sounded suitably classy and exotic, let us know.

#bbcracing, external, the BBC Sport Facebook page, external or 81111 on text from UK phones are the ways to get in touch. 

Frank Keogh
BBC Sport

"It's a bit like Groundhog Day as punters get stuck into Shutthefrontdoor, sent off 6-1 favourite last year when the final Grand National ride of retiring 20-time champion jockey AP McCoy.

"McCoy finished fifth but the horse, trained by Jonjo O'Neill for owner JP McManus, has been backed from 25-1 into 10-1 in the last 24 hours. Barry Geraghty takes the ride this time.

"Last year's winner Many Clouds still remains the favourite to follow up at about 8-1, with other leading contenders including The Last Samuri at 11-1 and 14-1 chance Holywell."

Scouse royalty is in the house with Coleen Rooney taking up her seat in an executive box...

Image source, Getty Images

... and there is some of the authentic House of Windsor type as well with Zara Phillips in attendance with World Cup-winning husband Mike Tindall.

Image source, Getty Images

Frank Keogh
BBC Sport

Image source, Frank

"The brollies are going up at Aintree as light rain falls at the Merseyside track."

Image source, PA

Hats on everyone.

The heavens have opened at Aintree.

Not a full hosing, but a fair old sprinkle.

Trainer Willie Mullins to Channel 4 Racing: "The horse gave Paul an awful ride and I thought that he had lost it when he went all over the place off the last. 

"I think Cheltenham took its toll on him. We'll take a look at him for Punchestown, but we might put him away for the year."  

Image source, Rex

It was a ragged old ride by Yorkhill, scrappy over the fences and inconsistent in pace, but he had the pace to see off the challenge of Le Prezien and Flying Angel after clearing the last.

1. Yorkhill 3-10 (Paul Townend) 

2. Le Prezien 8-1 (Sam Twiston-Davies)

3. Flying Angel 8-1 (Ryan Hatch)

6 ran

We are under way in the second race of the day.

The Mersey Novices' Hurdle has a six-strong field and Yorkhill is the well-backed fancy.

BBC Radio 5 Live

BBC Radio 5 live arrived at Aintree before the winning jockey was even awake this morning.

5 live Breakfast - with Eleanor Oldroyd - was broadcast live from the course from 06:00 BST. 

The baton has now passed to Mark Pougatch and 5 live Sport who will have commentary - via the ever-excellent John Hunt and Luke Harvey - on the big race at 17:15 BST.

Before then they will be wagging chins with Andrew Thornton, who will be riding in his 14th National, and bringing you coverage of all the day's earlier races over the National fences.

That didn't take long.

Trevor Whelan is back in the seat on The Romford Pele having previously been bumped out after O'Faolains Boy's withdrawal.

Image source, Rex Features

Some mornings you roll out of bed and just don't quite feel the full ticket.

Unfortunately for O'Faolains Boy that day was the biggest of his racing career so far.

The nine-year-old, a winner of the RSA Chase in 2014 and a 33-1 shot for today's big race, has been pulled out of the race by trainer Rebecca Curtis.

The deadline for any standbys to step up and fill in for any non-runners went by at 13:00 BST Friday so the field is down to 39 runners.