Penalty (Evans)published at 24 mins
Harlequins 3-7 Bristol
But Quins hit back almost immediately as Nick Evans slots their first points of the afternoon.
They needed that.
Summary
FT: Harlequins 21-19 Bristol
FT: Saracens 35-3 Worcester
Burger scores on Saracens debut
FT: Northampton 14-18 Bath
Bath's Faletau injured on debut
Penalty (Evans)published at 24 mins
Try (Varndell, con Henson)published at 21 mins
Harlequins 0-7 Bristol
Image source, Getty ImagesBristol finally make the breakthrough.
Danny Care throws an interception pass and Tom Varndell snaps it up and runs through to touch down beneath the posts. Gavin Henson slots the easy extras.
What a start for Bristol.
'Rain is relentless'published at 16:54 British Summer Time 3 September 2016
Northampton 0-9 Bath
Jeremy Guscott
Ex-England centre on BBC Radio 5 live"There is a relentless teeming of rain coming down. It's getting harder and harder, that ball isn't getting any drier.
"The Bath defence will be encouraged and they can get that line speed just right and put even more pressure on."
20 minutes to go at Franklin's Gardens.
Image source, Getty ImagesHarlequins 0-0 Bristolpublished at 21 mins
Bristol are ignoring the slippy conditions and are showing some beautiful handling skills. Gavin Henson, who we know divides opinion, has shown both snappy hands and acrobatics so far this afternoon.
His team have dominated this first 20 minutes, but still nothing to show for it.
Harlequins 0-0 Bristolpublished at 17 mins
We get our first real sighting of Scotland international Tim Visser, who scored 10 tries last term, as Bristol's defence is deemed illegal and Quins will have the penalty.
But the lineout is not a thing of beauty and this time the referee's whistle goes the way of Bristol.
Harlequins 0-0 Bristolpublished at 14 mins
Image source, Getty ImagesBristol have settled into their stride quickly and are making inroads into this Quins defence. Tusi Pisi's kick is gathered easily by Ross Chisholm who punts it out on the full. The London side haven't got their act together yet.
Harlequins 0-0 Bristolpublished at 11 mins
Will Hurrell, who scored against his current team in last year's Championship final for Doncaster, makes a lovely break for Bristol. They've certainly shown up this afternoon.
Harlequins 0-0 Bristolpublished at 7 mins
But it's Harlequins with the early possession as Jamie Roberts tries to battle through at least three defenders in their golden strip.
The rain is pouring down now as the ball is knocked forward. It's looking a little greasy out there.
Ford extends Bath advantagepublished at 16:37 British Summer Time 3 September 2016
Northampton 0-9 Bath
Northampton's indiscipline, which plagued them last year, is creeping in once again.
Saints concede a penalty at the scrum and George Ford makes no mistake from the tee.
Harlequins 0-0 Bristolpublished at 2 mins
What an adventure for Bristol. Former Wales international Gavin Henson kicks off in a strip identical to that of Bristol City. A united front from the South West.
Second half under waypublished at 16:32 British Summer Time 3 September 2016
Northampton 0-6 Bath
Image source, Getty ImagesThey're also playing again at Franklin's Gardens. Let's hope for a better second half than the first.
It wasn't great.
Kick-offpublished at 16:30 British Summer Time 3 September 2016
Harlequins 0-0 Bristol
We're under way in the second game of the day at Twickenham.
Bristol get their first taste of Premiership action since 2009, and it couldn't be on a bigger stage.
Relegation rivals Worcester just took a hammering from Saracens, will Bristol fair any better?
Image source, Getty ImagesThe teams are outpublished at 16:27 British Summer Time 3 September 2016
Harlequins v Bristol (16:30 BST)
We're just minutes away from the second game of the afternoon at Twickenham as newly-promoted Bristol walk out for their Premiership return.
Image source, Getty ImagesGet involved #bbcrugbypublished at 16:27 British Summer Time 3 September 2016
Harlequins v Bristol (16:30 BST)
Image source, Rex FeaturesSteve Bainbridge (Saracens fan): Great performance by Saracens - now time to scout the opposition!
'Weather ain't nice, is it?'published at 16:24
Harlequins v Bristol (16:30 BST)
Image source, Getty ImagesBristol director of rugby Andy Robinson looks anxious wandering through the Twickenham rain.
Bristol, who have apparently taken around 10,000 fans to the capital today, will be hoping that frown is turned upside down by the end of the day.
Second-half blitz gives Saracens victorypublished at 16:23 British Summer Time 3 September 2016
Saracens 35-3 Worcester
Image source, Getty ImagesIf you missed any of the action from Twickenham earlier you can catch up by reading Brendon Mitchell's match report here.
Part two of the London Double Header, Harlequins v Bristol, is coming up very shortly...
Get involved #bbcrugbypublished at 16:19 British Summer Time 3 September 2016
Harlequins v Bristol (16:30 BST)
'We're confident we'll be OK'published at 16:17 British Summer Time 3 September 2016
Harlequins v Bristol (16:30 BST)
Image source, Getty ImagesChris Booy continued to BBC Radio Bristol: "This year is about making sure we stay in the Premiership. a lot of experts are saying we're going to be bottom, we don't believe that.
"We think us, Worcester and Newcastle are relegation favourites if that's the right word, but we feel confident we'll be OK this season.
"Once we know we're in the Premiership next year then we can sign a few more of these top class players. We have some wonderful players, but could really do with that international experience and spark from an individual player."
Half-timepublished at 16:16 British Summer Time 3 September 2016
Northampton 0-6 Bath
I'll sum up that first half quickly. Bath's George Ford - one penalty, one drop goal. Not much else.
The weather is atrocious though and not making for flowing rugby.
'Seven years in the wilderness behind us'published at 16:14 British Summer Time 3 September 2016
Harlequins v Bristol (16:30 BST)
Image source, Getty ImagesBristol Rugby play their first game in the Premiership since relegation in 2009 when they take on Harlequins at Twickenham shortly.
Bristol chairman Chris Booy was on BBC Radio Bristol earlier and said "When you compare it to some of the stadiums we've been playing at for the last seven years, this is certainly where we want to be.
"This is special, we've been seven years in the wilderness but that's all behind us. The message from all of us is we've got to enjoy our experience in the Premiership."