Michael Vaughan hit an unblemished century to propel Yorkshire into the semi-finals of the Benson and Hedges Cup by eight wickets over Somerset yesterday.

And the draw, made immediately afterwards, gave Yorkshire a dream home tie with holders and one-day kings Gloucestershire, who beat them in the B&H Super Cup final two years ago.

The match will be played on Monday, June 26, by which time the new West Stand at Headingley will be in operation and a capacity 14,000 crowd is anticipated.

Vaughan's amazing 125 not out brought him his first century in one-day cricket, and it was a gold-award winning performance which stood head and shoulders above anything else the other five England stars playing could manage.

Even Darren Lehmann was happy to play a supporting role as Vaughan tore Somerset's attack to ribbons, and the Australian went straight down the pitch to offer his congratulations after Vaughan ran the single which took him to three figures.

Appropriately, it came off Andy Caddick, who Vaughan had earlier treated with elegant contempt while getting his innings off to a rapid start with a fierce assault on the new ball.

Somerset's 210 for seven was made to look completely inadequate by Vaughan, who dashed to his century off 112 balls, including 15 boundaries.

By the time Yorkshire had raced home with 13.2 overs to spare, Vaughan had smacked a further three fours and a six and faced a total of 128 deliveries.

Lehmann concluded the match with his sixth four in a 60-ball half-century and his unbroken third-wicket stand with Vaughan was worth 140 in 23 overs.

A delighted Vaughan said afterwards: "Playing for England has certainly given me added confidence. I think I have batted pretty well for the past couple of years, and to get a century today was icing on the cake.

"I have been dying to record a one-day century and was very disappointed to get out for 92 against Leicestershire in the group stages of the B&H.

"My record with Yorkshire in one-day cricket is not great, but this is the first year I have opened the innings on a regular basis, and you know where you are going when you bat first."

In glorious weather and in front of a packed house, Vaughan refused to be intimated from the off. He began by striking Steffan Jones over mid-wicket with a powerful blow and continued by elegantly off-driving Caddick to the fence.

So fierce was the assault that Yorkshire were already 34 by the fifth over when David Byas edged Caddick to Peter Bowler at slip.

Matthew Wood contributed seven to a 29 stand with Vaughan before being lbw hitting across the line at Jason Kerr, but this was Somerset's last success, their seven-man attack being ripped apart by the third-wicket pair.

The only awkward moment for Vaughan came when he was caught unawares by a Caddick bouncer, but otherwise he was fully in control, and the last of his boundaries was a firmly-middled drive for six off Michael Burns.

The ease with which Yorkshire cruised into the semi-finals was not apparent when Somerset, having won the toss, stood on 131 for one in 31 overs.

But the soft dismissal of captain Jamie Cox for 62 off a Lehmann full toss destroyed Somerset's self belief, and Yorkshire bowled so well that only 79 runs came off the last 20 overs.

Cox and Peter Bowler, who also made 62, put on 108 for the second wicket, after which the batting gently subsided.

Although Vaughan was the star of the show, Darren Gough was in great form and outbowled Caddick in a complete reversal of the recent Championship match between the sides at Headingley.

Gough soon claimed the wicket of his England colleague Marcus Trescothick, who has already hit three B&H centuries this season, the left-hander driving gently into Lehmann's hands at cover.

In his first six-over spell Gough gave away only seven runs - one fewer than Caddick from his first seven balls - and his final figures were 10-1-18-1. Ryan Sidebottom also kept things tight.