It's not just their attack which is smothering the Bears, the Bath defence is following suit, chasing down Ben Spencer's ranging kick into the Bears 22 and pinning them back.

Spencer almost sneaks into the corner down the blind side, but is stopped short, and the Bears are down to 14 again as replacement scrum-half Kieran Marmion is penalised for preventing Bath from recycling the ball.

Topsy Ojo
Former England back on BBC Radio 5 Live

Will Muir has the strength to finish.

The league leaders are showing why they have been so imperious all season long and so difficult to beat at home.

They are looking ominously good as time starts to tick away.

Topsy Ojo
Former England back on BBC Radio 5 Live

Mistakes are starting to creep into Bristol's game in their own half.

If these mistakes start to pile up, Bath will put their foot on the accelerator towards Twickenham.

The difference in Bath from the first half is night and day. It's the hosts who are playing the free-flowing attacking rugby now. Bristol are hanging on here.

Gareth Chilcott
Ex-England and Bath prop on BBC Radio Bristol

Good try from Bath, well worked out. It's a game changer.

Bath fans are just beginning to get a little bit noisy and are on the front foot.

Although there is a long way to go, you just feel that Bristol need to score next.

This is a vital part of the game for me.

Bristol take advantage of a penalty with a series of drives towards the try-line but James Dun is stopped short once again and Noah Heward's pass is just behind Gabriel Ibitoye, with the 13-try wing losing momentum and having to track back.

Finn Russell eventually forces the turnover before the hosts turn to their bench, with Thomas du Toit coming on for Will Stuart - not a bad option to have.

Topsy Ojo
Former England back on BBC Radio 5 Live

Kalaveti Ravouvou has had some game, he's been on the wrong end of a yellow card but he's made some stellar runs.

When the game opens up Bristol looks dangerous.

Bath have had a rocket from Johann van Graan at the interval, if I had to guess... they have been ferocious in every sense since the turnaround.

However Ted Hill is called on to make a vital last-ditch tackle to prevent Kalaveti Ravouvou going in down the Bears right.

Bristol can conjure things out of nothing...

Some game this, fitting of a semi-final.

Topsy Ojo
Former England back on BBC Radio 5 Live

Here we a go.

What a minute or so after half-time?

Bath are right back in this after their first try.

We're in for a treat in this second half.

I don't know about you, but that wasn't nearly enough time to get my breath back, so goodness knows how the players feel.

Finn Russell gets us back under way... the clouds are gathering but still dry for now.

I'll make one prediction, and one only, these are the two biggest scorers in England in the final 20 minutes of matches this season, and they aren't about to stop tonight...

Quick thumb poll before we get back under way.

Who do you think will go through to next weekend's Premiership final at Twickenham?

Thumbs up for Bath, thumbs down for Bristol.

Image source, Getty Images

Sophie Hurcom
BBC Sport at the Rec

So much has been made of how stacked Bath's replacements bench is so I had a look at the stats over all 18 rounds of the Premiership to see quite how that has translated onto the scoreboard this season.

The answer? In the final 20 minutes of matches, when they typically start to bring most of their replacements on, they have gone on to concede the least - just 77 points in 18 rounds - and scored the most - 209 points - of all 10 clubs.

Tonight Thomas du Toit, Niall Annett, Ross Molony, Josh Bayliss are just some of the names primed for Bath to come on during this second half.

Bristol have so far had an answer to stopping Bath, but they need the stamina to keep this up for another huge 40 minutes when fresh legs, and fresh power, starts coming on.

Gareth Chilcott
Ex-England and Bath prop on BBC Radio Bristol

What Bristol have been trying to do is make Bath play quicker. Bristol's defence has been good and with the ball in their hand they have always been questioning Bath.

They have been playing some brilliant rugby.

If I was Johann van Graan I would be saying, well first things first, let's defend well, let's take the sting out of them and let's get back into this game slowly but surely.

Topsy Ojo
Former England back on BBC Radio 5 Live

It's been a brilliant first half. Not high-scoring but full or drama and events.

Bath are strong finishers, we know that, but they've got some questions to answer in the second half.

Image source, Rex Features

What an absorbing half of rugby.

Bristol played out a 12-try thriller against Quins last weekend to secure this fixture and have put 36 points on Bath twice already this season, but tonight we have seen as much of their defensive steel as we have their scintillating free-flowing, unstructured attacking.

James Dun's close range finish after a breath-taking move from one try-line to another is the difference at the break, with AJ MacGinty and Finn Russell notching a couple of penalties apiece.

Whatever you do, don't miss a moment of the second half, runaway table toppers Bath, seeking a historic treble, are right up against it in their own back yard thanks to their noisy neighbours.

AJ MacGinty is given the chance to slot a penalty from just outside the 22 on the left to end the half after Guy Pepper is penalised at the break down.

Clean strike, through the uprights, and the lead is seven once again...

Topsy Ojo
Former England back on BBC Radio 5 Live

It has been a chess match, both teams have been going at each other.

It's been a compelling first half for sure.