Gloucestershire 220, Surrey 214
Retiring Geraint Jones makes 50 for Glos
Surrey's Dernbach (6-35) takes hat-trick
Tom Smith's best score in the One-Day Cup this season is 37 not out. They need a lot more than that from him now. He gets under way with a single.
And with that, I hand over to my esteemed colleague Jamie Lillywhite to take you through the second half of Gloucestershire's innings.
Gloucestershire 108-5 (Jones 6)
It's that man Azhar Mahmood again as Gareth Roderick chops an angled delivery into his stumps. That was the key wicket for Surrey, the right-hander having been there since the third ball of the innings.
Things looking bleak for Gloucestershire now with only the lower order to come.
Image source, PAAs well as playing for England, Geraint Jones also represented Papua New Guinea, the country of his birth, at international level. Very few county cricketers can claim that double distinction.
He can only add one run to his score from another canny over by Surrey skipper Gareth Batty.
Geraint Jones is under way with four runs off Azhar Mahmood - a 39-year-old facing a 40-year-old. How many other sports could that happen in at a major cup final?
Mike Smith
Former Gloucestershire and England seam bowler on BBC Radio Bristol
Quote MessageIt's nipped back a little bit but you need to expect that at Lord's when someone's bowling the Pavilion End. Even if Benny Howell had hit it, it wouldn't have gone anywhere.
Gloucestershire 100-4 (Roderick 38)
Another major setback for Gloucestershire as Benny Howell is clean bowled by Azhar Mahmood after making the cardinal mistake of leaving a gap between bat and pad (the first lesson my grandad taught me was don't leave a gap between bat and pad!). They badly need Gareth Roderick to bat most of the innings now.
Geraint Jones - and Ashes winner in 205 - receives a generous ovation as he walks out for the final innings of his career.
Gareth Batty tries his luck from round the wicket to Benny Howell, who is bamboozled totally by the final ball of the over which spins back and clips the top of the pad before running away for three leg-byes - 100 up for Gloucestershire.
Azhar Mahmood produces a bouncer and Benny Howell is not in full control of his pull shot as he picks up a single. Only two from the over.
With the ball turning, Gareth Batty brings in a leg-slip, but Benny Howell is undaunted as he stretches forward to sweep his first boundary. Who'll be the happier side at the moment - Surrey or Gloucestershire? How many do you think Gloucestershire will make? Let us know using #bbccricket .
Nick Compton
Middlesex and England batsman on BBC Test Match Special
Quote MessageI think Hamish Marshall was doing the right thing there but Gareth Batty might count himself a little bit lucky that he's forced a mistake. He's pushed most of his deliveries down the legside and he hasn't quite found his rhythm.
Cricket is certainly a game for all the ages - if you add those of Tom and Sam Curran together, they are still three years short of the venerable Azhar Mahmood.
A veteran of 21 Tests and 143 one-day internationals for Pakistan, Mahmood is a wily campaigner and Gloucestershire do not take any liberties from his opening over. A loud lbw appeal against Roderick is turned down with ball jagging back off the pitch. Four off it.
Benny Howell is a developing all-round talent and Gloucestershire need him to fire with both bat and ball today. He is under way with a single but a smart piece of fielding by 40-year-old Azhar Mahmood from the final delivery earns him the chance to turn his arm over for Surrey.
Gloucestershire 78-3 (Roderick 29)
Image source, Getty ImagesLooks like Gareth Batty's leg-side line is a deliberate tactic as Hamish Marshall is lured out of his crease and Gary Wilson makes a smart stumping. The fact that the delivery is also called a wide does not dampen the Surrey celebrations. Gloucestershire now in serious strife with two of their two most experienced batsmen back in the dressing room.
Hamish Marshall drives and Gareth Batty makes an excellent diving save at mid-off to keep Gloucestershire to a single. Sam Curran overpitches again next ball and this time Gareth Roderick finds the gap and the ball scoots away to the rope.
The final delivery is short, but Marshall picks out the man at deep square leg and has to settle for one.
Time for spin as Surrey skipper Gareth Batty brings himself into the attack. The first ball is a loosener down leg-side which Gary Wilson fails to take and it runs away for five wides.
Batty follows it with another wide prompting jeers from a section of the crowd and Surrey give away another run as Jason Roy throws at the stumps and the ricochet runs into a gap. Jeers break out among a section of the Gloucestershire supporters - and 11 from the over make it a good one for their team.
Sam Curran gives Hamish Marshall room outside off stump but with four for the taking, the New Zealander cuts straight to the fielder at backward point. It is Curran's best over so far, but Marshall takes a single to mid-off from the final delivery to deny him a maiden.
Tom Curran finds a little bit of lift as Gareth Roderick fends the ball off for a single. But the young bowler strives again for a little extra pace and Hamish Marshall lofts a controlled on-drive away for four.
Sam Curran relieves Jade Dernbach from the Pavilion End and a short ball is pulled away for one by Gareth Roderick to take the total to 50. Hamish Marshall tries to dab an angled ball away past the slip cordon, but it is too close to him for the shot and he fails to make contact.
Roderick collects a single to mid-off to end the over, with Surrey very happy with the situation at this stage of proceedings.
Gareth Roderick tries to unsettle Tom Curran by moving across his stumps, but it doesn't bring him any runs and only two come from the over. Gloucestershire need a major partnership, but a few boundaries would certainly help their cause at this stage.