Lions coach Graham Henry suffered another injury scare as Leicester comfortably completed the second leg of a possible trophy treble against arch-rivals Bath at Twickenham.

A week after Lawrence Dallaglio suffered tour-threatening knee trouble, his fellow Lion and England star Iain Balshaw was in the wars.

Bath ace Balshaw went off midway through the second-half of an uninspiring Zurich Championship play-off final, clutching his left arm.

And Henry is certain to require an urgent fitness update while he sweats on Dallaglio's availability for the trip to Australia in just 18 days' time.

Balshaw could make little impact in front of a shirt-sleeved 33,500 crowd, being handed few attacking opportunities as Leicester won easily.

Captain Martin Johnson, scrum-half Austin Healey and wing Winston Stanley collected the Tigers' touchdowns, brushing Bath aside despite Tim Stimpson missing four kicks at goal.

Bath substitute Rob Thirlby bagged a consolation try, but the West Country club's proud unbeaten Twickenham record - 10 domestic cup final successes - fell crashing around their ears.

Having won the Premiership title several weeks ago, Heineken Cup success in Paris next Saturday would underline Leicester's supremacy at club level in Europe.

Leicester resisted any temptation to rest players just six days before their Heineken Cup final appointment with French champions Stade Francais, as they embarked on the second leg of a possible trophy treble.

Their international big-guns, led by skipper Johnson, all took the field for English rugby's inaugural play-off final against a Bath side amazingly unbeaten from all their previous Twickenham visits during a spell stretching back 17 years.

Rival full-backs Stimpson and Matt Perry both missed early penalty chances during a protracted settling down period, and despite perfect conditions, the normally-reliable Stimpson sent another kick wide on 14 minutes.

Bath responded by cutting Leicester's midfield defence wide open, their Australian centre Shaun Berne ghosting past several players and recycling possession from which wing Tom Voyce almost prospered.

Berne though, suffered a leg injury in the process, and was stretchered off as Bath sent on 20-year-old Sam Cox to replace him.

Perry opened the scoring while his team-mates reorganised, slotting a short-range penalty, but the kick stirred Leicester into action.

They laid siege to Bath's 22, centre Pat Howard and flanker Neil Back both making in-roads until the West Country side ran out of numbers and Johnson ploughed over for a rare try that referee Steve Lander awarded with assistance from video official Brian Campsall.

Campsall, the first video referee used in an English club match, ruled that Johnson grounded the ball despite a combined tackle by Perry and prop John Mallett.

Stimpson added the conversion, and Bath immediately suffered another blow when Perry suffered a head wound that put him off for almost 10 minutes while Thirlby deputised.

Try-scoring opportunities remained at a premium, and Stimpson completed a hat-trick of penalty misses deep into first-half injury time, which brought an unsatisfactory end to an equally unimpressive opening period.

Trailing 7-3 at the break, Bath made a double half-time substitution, sending on prop David Barnes for Simon Emms and replacing Andy long with his fellow England international Mark Regan.

But Leicester drew first blood, Stimpson at last finding his range through a penalty strike after Bath strayed offside, and the Premiership champions went for the jugular.

Wing Geordan Murphy almost scythed through the Bath defence, and after referee Lander whistled against Bath, scrum-half Healey touched down from a quick tap-penalty.

Stimpson's conversion extended the Leicester lead to 17-3, but with an eye on next Saturday's Parc des Princes trip, Tigers boss Dean Richards immediately sent on Jamie Hamilton for Healey.

Prop Graham Rowntree had also departed early, yet Bath were rattled to the core, a factor underlined courtesy of Catt's hurried defensive clearance which sliced off his boot at almost 90 degrees.

Healey, who had been off for blood, returned on the hour-mark, but in a different position, taking over from fly-half Andy Goode.

Bath grew increasingly desperate to try and rescue the game - and their unbeaten Twickenham record - but that task was compounded through Balshaw's 64th-minute exit.

Leicester took immediate advantage of Bath's problems once again, centre Leon Lloyd surging clear and then quick ball finding Tigers' Canadian World Cup wing Stanley for another try.

Bath were powerless to prevent Tigers from securing yet more silverware - they haven't won a domestic trophy since 1996 - and there could be no doubting Leicester's supremacy on the day as play-off glory followed league title success.

The Heineken Cup would complete a unique and remarkable Treble.

Man of the match: Martin Johnson (Leicester).