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full time: Welsh 29, Leeds 20 (Welsh win 60-58!)
Lozowski knocks on as he goes for a drop goal!
Ross lands it! Welsh 29, Leeds 20 (agg 60-58)
Welsh awarded a penalty in front of the posts!
We are set for a grandstand finish with just one point in it!
Ross misses conversion. Welsh 26, Leeds 20 (agg 57-58)
It's all Welsh now and Ollie Stedman goes over!
Ross remarkably converts from the touchline! Welsh 21, Leeds 20 (agg 52-58)
Seb Stegmann scores for Welsh
Pete Browne stetches for the corner, but can't make it. However, Welsh have a penalty in front of the post.
The momentum has really swung. Welsh need two converted tries
Lozowski converts. Welsh 14, Leeds 20 (agg 45-58)
Could that be decisive - Leeds score a second try via Charlie Beech?
But the kick is missed.
Ross lines up a penalty for Welsh. They need him at his best now
Lozowski converts the penalty. Welsh 14, Leeds 13 (agg 45-51)
Welsh's Kirwan yellow-carded for obstruction
Lozowski's on target. Welsh 14, Leeds 10 (agg 45-48)
Leeds have a penalty this time
Ross slots it. Welsh 14, Leeds 7 (agg 45-45)
The Exiles get another very kickable penalty - surely Ross will slot this one!
Ross slices wide! Never looked like going over
Welsh win a scrum penalty at the restart
There is a stoppage while medics get ready to stretcher off Leeds centre Rob Vickerman
Welsh break into Leeds' 22, but a poor pass from replacement scrum half Chris Cook leads to a knock-on
But he misses, so the jitters are affecting him too
Leeds penalised for not releasing and Ross has a kick to level the tie
Leeds have replaced Hughes with Alex Lozowski at half-time
Welsh edged an open first half, but Leeds will be happy enough with the threat they posed. Fortunately for the hosts, Glyn Hughes has not kicked as well as he did in the first leg - otherwise the tie would have a very different complexion
Half time: Welsh 11-7 Leeds (42-45 agg)
An exciting Welsh attacks ends in a knock-on, while scrum half Tyson Keats goes off injured
Hughes misses the straight-forward kick. Clearly the pressure is affecting him
Welsh waste a scoring chance at one end before Hughes gets a penalty chance for Leeds
Ross kicks a penalty to the corner and Welsh have an attacking line-out
There is no doubting Leeds' ambition and Welsh have not been able to keep as tight a rein on proceedings as they would have liked.
Ross lands it. Welsh 11-7 Leeds (42-45 agg)
Leeds captain Jacob Rowan goes for a quick 22-drop out, but his side end up being penalised
That was a disappointingly soft try for Welsh to concede, but there is plenty of time left
Hughes converts. Welsh 8-7 Leeds (39-45 agg)
Try awarded, scored by Leeds full back Stevie McColl
Leeds look to have scored, but referee Greg Garner goes to the TMO
Ross misses the conversion, but Welsh still lead on aggregate
Welsh 8-0 Leeds (39-38 agg)
Welsh score the first try as Carl Kirwan powers through on a great line
A kicking exchange gives Welsh a line-out 30m out
Leeds are playing positively, despite the missed kicks
Hughes snatches his kick wide - a let off for Welsh
Leeds win a penalty inside the Welsh 22 and Hughes brings the ball back for a shot at goal.
Ross slots it for 3-0 (34-38 agg)
Leeds don't release in the tackle and Welsh have a penalty in front of the posts
Welsh win a penalty as they go for a driving maul and Ross kicks for the corner
Glyn Hughes misses from the halfway line, so aggregate score stays 31-38
Poor start as Gordon Ross kicks straight and then Welsh concede a scrum penalty
Welsh, in red, are roared on to the field
One Leeds player to watch is wing Jonah Holmes, who started Welsh's first Premiership match last season.
Leeds are out on the pitch in their green shirts.
Welsh have lost just once here all season and beat Leeds twice in the regular campaign, so will hope that bodes well.
Kick-off is at 12.45pm. It should be a tense match.
It is definitely cricket weather here at the Kassam Stadium, but few are expecting such a high-scoring game as we saw last week at Headingley.
Lovely day for rugby @LondonWelshRFC v Leeds in the semi final of the Championship. Great crowd! Come on the Welsh! http://t.co/BWfH20GiXx— @CapNetSols 18 May 2014
Good atmosphere here at Kassam! Not long now before @LondonWelshRFC play for semi-final glory! #coyw #promotionpush— @MikeG_Jones 18 May 2014
On-loan prop Tom Bristow, an unused replacement for Leicester in their Premiership semi-final defeat to Northampton, is also on the Welsh bench today.
Here are the teams...
London Welsh: Awcock, Stegmann, May (capt), Jewell, Scott, Ross, Keats, Trevett, Morris, Edwards, Spencer, Corker, P Browne, Kirwan, Stedman.
Reps: Vella, Bristow, Tideswell, West, Quill, Cook, J Lewis.
Leeds: McColl, Holmes, Vickerman, Burdon, D Doherty, Hughes, J Doherty, Beech, Nilsen, Tussac, Beck, Myerscough, Sisi, Rowan (capt), Burrows.
Reps: Graham, Imiolek, Hooper, Walker, Green, Georgiou, Lozowski.
To read our preview coverage, click here http://www.oxfordmail.co.uk/sport/rugby/london_welsh/
Should the aggregate score be level at full-time, there will be 20 minutes of extra-time. A tie at that point would be decided by tries scored and, if they are still level, a kicking contest. Welsh outscored Leeds three tries to two in the first leg
The prize on offer today is a play-off final against Bristol, who saw off Rotherham in their semi-final yesterday. London Welsh must win by eight points to progress after losing 38-31 in the first leg at Leeds.