Tim Murtagh (3-53) took two of the four wickets, Gareth Berg ending with 4-72.
And Tim Murtagh's eight-over new-ball spell of 2-19 began to vindicate Udal's decision to declare 91 runs behind.
Johnny Murtagh confirmed his position in racing's elite with his second Derby victory, this time on High Chaparral.
Saj Mahmood got Lancashire off to a flier with the ball, bowling Chris Murtagh to leave Surrey 22-1.
Johnny Murtagh will have the pick of these, but Fallon could potentially ride one of the horses he rejects.
That left Essex 15-2 and gave Murtagh his second wicket after he had earlier trapped Cook leg before for 4.
Murtagh added to England pair Alastair Cook and Ravi Bopara's woes by removing both early on as Essex slumped to 32-4.
"We've all played against some of the England guys for their counties but never against them as a unit, " added Murtagh.
The visitors resumed on 110-6 and lost Gareth Batty early to a diving catch by Josh Davey off Tim Murtagh's bowling.
The Sheikh Mohammed-owned filly came home ahead of Mrs Lindsay, ridden by Irishman Johnny Murtagh, while Diyakalanie was third under Thierry Thulliez.
Spencer began the week as evens favourite to retain his Irish crown with Michael Kinane at 3-1 and Johnny Murtagh at 4-1.
BBC: SPORT | Other Sport | Horse Racing | Spencer departs from O'Brien post
But a flood of money led to Murtagh's odds being cut to 5-4 and Kinane's to 6-4 before Cashmans stopped taking bets.
BBC: SPORT | Other Sport | Horse Racing | Spencer departs from O'Brien post
Former Northern Ireland Under-21 midfielder Conall Murtagh, 23, has arrived from Wrexham.
Murtagh claimed figures of 6-44 from his 16.2 overs as Essex lost their last seven wickets for 30 runs in 72 balls.
Murtagh is now the favourite to take over from Spencer at Ballydoyle.
BBC: SPORT | Other Sport | Horse Racing | Spencer departs from O'Brien post
Tim Murtagh was the pick of the bowlers at Lord's as Essex, who were put in to bat, were restricted to 115-9.
This is what has made international stars of big race jockeys like Frankie Dettori, Johnny Murtagh from Ireland and Christophe Soumillon from Belgium.
Murtagh and Berg added a further 33 before both fell in quick succession, both trapped leg before by Danish Kaneria and Ten Doeschate respectively.
Freemantle, ridden by Johnny Murtagh, made the break, with 2-1 favourite Crowded House struggling to keep up as Black Bear island made his move.
John Rafferty was favourite to take the job earlier this week while Donal Murtagh, Eamon McEneaney and Peter McGrath had also been linked with post.
Middlesex started the final day on the front foot when seamer Tim Murtagh found Mal Loye's edge, earning a catch for England captain Andrew Strauss.
But Murtagh bounced back, and with the renewed support of Oxx and owner-breeder, the Aga Khan, was Irish champion jockey in 1995, 1996 and 1998.
And Murtagh bagged the first English Classic of the 2002 season.
Johnny Murtagh had the four-year-old, trained by Aidan O'Brien, handy throughout and he stayed on stoutly to beat the filly Sariska, with High Heeled in third.
McCain's campaign on Wednesday sent out an e-mail with a statement from John Murtagh, who said his home was firebombed by the Weather Underground in 1971.
As if the wealth of talent at the club was not already known, they revealed yet another weapon with rookie paceman Tim Murtagh bagging a five-wicket haul.
And the momentum swung further Glamorgan's way when Michael Powell ran out Kartik and Croft took his fifth wicket of the innings, having Tim Murtagh caught behind.
The odds on favourite Frozen Fire's jockey Johnny Murtagh dismounted to boos and heckles from punters who were unhappy with the slow early pace of the race.
Canavan's running was causing the Cross defence all sorts of problems while Rory McCann ensured a nightmare afternoon for the Armagh champions' usually reliable full-back Donal Murtagh.
The family of New Zealand projectionist and film collector Jack Murtagh sent the highly flammable prints to the organisation for safe keeping after his death in 1989.
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