So, Michael Klinger and Chris Dent are out in the middle to open the innings for Gloucestershire. What kind of score will they be after? The weather looks set fair, so they'll be hoping for something in the region of 280-300. Here we go...

Just over a decade ago, Gloucestershire were, without question, the kings of limited-overs cricket. Astutely guided by coach John Bracewell and with a team featuring inspirational Aussie all-rounder Ian Harvey, they won seven trophies between 1999 and 2004.

Harvey is now on the coaching staff and doing his bit to try and help a new generation bring the glory days back to Bristol.

BBC Points West went to meet Harvey and members of the current squad and you can watch what they had to say about the team's prospects against Surrey, by clicking here.

With Surrey having opted to bowl first, the spotlight will immediately be on Sam and Tom Curran. Even though they are only 17 and 20 respectively, Sam and Tom have become the spearheads of the Surrey attack. Alec Stewart says Sam is the best 17-year-old he has ever seen and though neither was chosen for the England Lions squad this winter, it is quite conceivable that both will considered for international honours soon.

The One-Day Cup final will be anemotional occasionfor former England wicketkeeperGeraint Jones, who plays his final game for Gloucestershire before retiring.

"I could be a blubbering mess," admitted the 39-year-old, who was part of the Kent side beaten by Essex in the FP Trophy final in 2008.

He made six of his 34 Test appearances at the home of cricket and was only on the losing side once, against Australia in 2005, but England, of course, turned that series around for one of the most famous Ashes triumphs of the modern era.

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Surrey skipper Gareth Batty is now 37, with 19 years of service behind him for three counties and his country.

The former England off-spinner was a Lord's winner with Surrey in 2011, in the CB40 final against Somerset. But he has also twice lost there with his previous county Worcestershire, in the old C&G Trophy, in 2003 and 2004 - each time to Gloucestershire.

Although he does have the experienced figure of Sri Lankan star Kumar Sangakkara at his disposal, Batty admits there is some excitement within his young team at the prospect of playing in a Lord's final.

“I feel a bit like a parent must do on Christmas Eve trying to calm the kids down," he told BBC London 94.9. "The boys are absolutely chomping at the bit.

“It’s the showpiece for any county cricketer. It’s a big occasion, there’s no getting away from it, but we have to treat it as much as possibly like any other game of cricket.”

Image source, PA

Image source, Getty Images

Last week, Gloucestershire captain Michael Klinger said he had not given up hope of playing international cricket for Australia, even though he is 35.

With Chris Rogers and Michael Clarke both leaving the international stage after the Ashes series, an opening was there - but the Australian selectors decided it was time to look for younger options to fill the gaps when they named the squad to tour Bangladesh.

After his starring role in Gloucestershire's semi-final victory, he now has the opportunity to show off his batting skills on the grandest stage of them all.

Did Australia get it wrong? Let us know on Twitter using #bbccricket.

There are a number of options to listen to match commentary today, and enjoy our live text at the same time.

Test Match Special will be on BBC Radio 4 LW from 10.15 BST, and BBC London 94.9 and BBC Radio Gloucestershire also have their own commentary teams at the ground.

Click on the live coverage tab at the top of this page to make your choice.

Who is going to win the One-Day Trophy? We want your opinions, so please get involved during the match via Twitter using #bbccricket.

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Surrey have relied heavily on the run-scoring of Jason Roy, Steven Davies and Kumar Sangakkara with each of them making two centuries.

They began with a statement of intent against Northants as Roy made an astonishing 108 off 79 balls in a 220-run victory and won six of their eight games to top Group A.

Roy was at it again in the quarter-finals as his 112 led Surrey to a 17-run win in a rain-affected game against Kent, but in the semi-final against Notts, it was Sangakkara's turn to shine with a sublime 166 off 138 balls as they edged home by four runs at The Oval.

Surrey skipper Gareth Batty has won the toss and opted to bowl first.

Gloucestershire make one change to the side that beat Yorkshire in the semi-finals with paceman Craig Miles replacing Liam Norwell, while the Surrey side shows three changes with Jason Roy, Azhar Mahmood and James Burke in for Ben Foakes, Zafar Ansari and Aneesh Kapil.

Gloucestershire:  Dent, Klinger, Marshall, Roderick, Howell, Jones, J Taylor, Fuller, Smith, Miles, Payne. 

Surrey: Roy, Davies, Sangakkara, Burns, Wilson, S Curran, Mahmood, Burke, T Curran, Natty, Dernbach.

Gloucestershire reached the knockout phase of the One-Day Cup by finishing second behind Surrey in Group A after winning five of their eight games, with two defeats and one no-result.

A highlight was Gareth Roderick's 104 off 118 balls in a thrilling one-run victory over Leicestershire at Grace Road, but they ended the group stage with a 12-run loss to today's opponents Surrey.

In the quarter-finals, they disposed of Hampshire by four wickets and then a magnificent unbeaten by skipper Michael Klinger, aided and abetted by Hamish Marshall with 78 not out, saw off Yorkshire by eight wickets to book their trip to Lord's.

Image source, PA

Yorkshire won the County Championship, Lancashire lifted the T20 Blast trophy, but today the Roses stranglehold on the English domestic game's glittering prizes will be broken at Lord's.

Welcome to our coverage of the Royal London One-Day Cup final. 

"My old coach used to say that if you were in it for the match, if you were in it for the trophies, you were in it for the wrong reasons," American author John Irving, external once stated.

Try telling that to the players of Surrey and Gloucestershire.