Jack Leach, Craig Overton and Lewis Gregory shared nine wickets as Somerset stepped up their challenge for a first ever County Championship title with victory by an innings and 64 runs over Glamorgan inside three days at the Cooper Associates County Ground, Taunton.

Left-arm spinner Leach finished with 3-46 and seamers Overton and Gregory 3-29 and 3-68 respectively to restrict the visitors to 183 all out in their second innings from an overnight 30-1. Asa Tribe top scored with 49, while Sean Dickson made 47, but the Welsh county were comprehensively outplayed in all departments.

Somerset took 23 points from the game to heap pressure on rivals Nottinghamshire and Warwickshire in what is building towards the most thrilling finale to the title race in years. Glamorgan had to settle for three points and their challenge appears to be petering out.

The hosts did not have to wait long for a breakthrough when play began five minutes late because of a shower. With 12 runs added to the Glamorgan total, skipper Kiran Carlson nicked a forward defensive push off Migael Pretorius to wicketkeeper James Rew and departed for a duck.