Surrey finally broke through in the third over after lunch. Atkinson produced a fine delivery which nipped away at decent pace and Vaughan (36) was held at second slip.

Worrall got a deserved success with a ball which shaped away that Tom Abell edged low to second slip for a duck, but Lammonby and Tom Banton got stuck in for the next 20 overs although aggressive shots were rare in their third-wicket stand of 48.

Clark returned to remove Banton for 26, turned around by a straightish delivery and Lammonby played his first poor shot when he moved across his stumps to Worrall and had his leg-stump pegged back. He’d faced 173 balls with seven fours.

Atkinson’s pace proved too much for James Rew who played on for, before Clark struck with successive deliveries after tea. Kasey Aldridge (14) was bowled around his legs aiming towards fine leg and Migael Pretorious bowled groping forward without scoring.

It did not look as if Somerset would make 200 but Gregory and Davey prospered as the bowlers finally tired.

It was the redoubtable Clark who came back to break the stand when he nipped one back into Davey’s pads.

Jack Leach was expertly taken down the legside by Ben Foakes – the 500th dismissal of his first-class career – but the day ended with Dickson returning to help Gregory, who hit three sixes and five fours, add a further 33.