Somerset close on 227-7 - lead by 191
Somerset opener Lammonby makes 116
Essex close on 337-8 with first-innings lead of 36
Team with best first-innings score wins trophy if game drawn
Green 10, Lammonby 20
The winds begin to howl once more around these empty Lord's stands.
A touch haunting.
Plenty of "oohs" and "aaahs" from Sam Cook once again as he toils away, but there are more runs on offer for both Ben Green and Tom Lammonby.
Somerset just five runs behind now.
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Just a reminder that we've got two games of cricket on the BBC for you this afternoon.
Andi's definitely for the right idea for a relaxed Saturday afternoon.
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Trail by nine runs
Another Jamie Porter over ticks by and Tom Lammonby and Ben Green steadily accumulate three more runs.
We're moving towards parity once again on the scoreboard.
Image source, Getty ImagesGreen 9, Lammonby 15
Four more to the total for Somerset.
Very grey overhead now at Lord's and all that morning sun has vanished.
Essex having little joy at the moment with this ball that's 10 overs old.
Varun Chopra
Essex batsman on BBC 5 Radio Live Sports Extra
In this situation a draw is no good for Somerset, they have to set Essex something.
Lammonby 14, Green 6
Couple of runs from that Porter over. One each for Tom Lammonby and Ben Green.
Somerset having little trouble so far in this second dig.
They trail by 16.
Jamie Porter back on from the Pavilion End after Simon Harmer had a go for the last over before lunch...
Trail by 18 runs
Tom Lammonby into double figures as he clips Sam Cook to the fine leg boundary for four.
Cook a little off his usual disciplined line and length at the start of this session.
Somerset 12-0
Here we go then for the afternoon session.
Somerset are 24 runs behind. How is this final going to unfold then across the next session?
Sam Cook to resume with the ball from the Nursery End for Essex to Tom Lammonby.
Image source, BBC SportCheers Gary,
Here's the latest view from the middle just before the bell is rung to signal five minutes before the restart.
It's lightly spitting out there, but if you were a club cricketer, you'd play through this happily all afternoon.
Off comes the hover cover as I type that very sentence.
Adam Williams is in place at Lord's to take you through the afternoon session.
Although the groundsmen appear to be hovering. What's in store Adam?
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Marka27: Somerset have to score big and quickly so they can put Essex in with the hope of bowling them out.
Should make for a fascinating couple of sessions today.
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Johnathan Crowe: Lifelong Essex fan here. Some may criticise the fact that whoever gets the first innings lead will win the trophy in the light of a draw. But Essex have had to score their highest BWT score to gain that lead. Highest previous score was 298.
Also, Essex have scored by far the highest total against Somerset this season (next highest was 200 all out), at an average of 42/wicket, and aggregate runs against Somerset was 1309 in 10 innings for 98 wickets, average 13.35/wkt. Pretty impressive from Essex.
Hard to argue when you lay the stats out like that.
Vic Marks
Ex-England spinner on BBC Radio 5 live Sports Extra
That was a very cagey session from both sides, Essex will be happy with the fact that they went past Somerset's 301 but they got a little lead of 30.
Somerset will be pleased in the sense that they've got 10 wickets there.
If the weather stays fine there's plenty of time to create a proper match rule result.
Somerset 12-0 (trail by 24) - lunch, day four
I said earlier that the rain might arrive during the lunch interval and they are in fact bringing on the covers.
The radar doesn't look overly promising with plenty of showers to the north of London.
England women v West Indies women (13:00 BST)
There's plenty of live cricket across the BBC this afternoon.
As well as the continuation of this final, there's also the first free-to-air televised women's cricket in 27 years on BBC Two. Coverage gets under way at 12:45 BST.
England women and West Indies women go head-to-head in their third T20 international and you can follow it all below.
England women win the third Twenty20 by 20 runs to take an unassailable 3-0 lead in the series at Derby.
Read MoreSomerset 301 & 12-0 v Essex 337-8
Simon Harmer speeds through a maiden and that's lunch.
A good little session for Somerset as they get through it unscathed.
They still trail by 24, but it's all set up for a push this afternoon.
Green 4, Lammonby 8
Tom Lammonby guides Sam Cook down to the fine-leg boundary and the fielder can't get round. Four.
Another couple off the over, and Jamie Porter will get another one in before the lunch break.
In fact, Essex are turning to Simon Harmer for a bit of spin...
Green 4, Lammonby 2
Ben Green gets off the mark with a boundary as he guides one from Jamie Porter past the slips.
Nowt else off the rest of the over except a shout for lbw which may have been a bit high.
Can Essex squeeze in another couple before lunch? Five minutes to go.
Green 0, Lammonby 2
Tom Lammonby gets off the mark with a couple. Sam Cook then beats the left-hander outside off stump with a jaffa.
Two overs to go before lunch, three at a push maybe.
Image source, Getty Images