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A few Premiership clubs have been known to flash the cash a little bit - Bath and Saracens spring to mind.

But poor old Harlequins barely have two sticks to rub together.

It's been a less than inspiring season from the Londoners, but boss Conor O'Shea remains committed to their tried and tested formula.

"We don't buy success - we build it," he told Press Association Sport.

"I know we're judged on results - but I'll take the heat for that, not the players.

"I know we're developing another generation of players coming through. They are going to be outstanding for this club, and they are going to be outstanding for England."

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Interesting one this is.

Sale are starting to look the business, having beaten Saints and Saracens in the last few weeks, while Leicester have rekindled their form with four wins out of five.

They are both one point off the top four and will fancy their chances of breaking into the play-off party.

Tigers have England lock Geoff Parling back after a knee injury, while Sharks turn to Nick Macleod at fly-half with Danny Cipriani on international duty.

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Northampton can open up as much as a 14-point gap at the top of the Premiership tonight - at least until bath face Exeter tomorrow afternoon.

And the Premiership champions are 22 points above this evening's visitors, so it should be easy pickings, right?

"We know we are top at the minute and know that everyone behind us is fighting pretty hard to catch us up," Saints forwards coach Dorian West told BBC Radio Northampton.

"We are not playing against any mugs, they are all good sides and they are all desperate to win."

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Possibly not one for the purists this.

The Premiership's bottom two clubs face off at the Kassam tomorrow, with the hosts looking to improve on their one-point haul for the season.

Irish are showing progress, however, having made Saints and Leicester Tigers work hard for their wins over the past two weeks.

A quick comparison of the numbers tells you where Quins have been struggling this season. Their points against is competitive, but only the bottom two teams have scored less points than the Londoners.

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Saracens will be a little bit miffed that they failed to take advantage of Bath's defeat by Saints last week.

Sarries would have gone second had they beaten an impressive Sale side.

Against Newcastle, who played their part in a tremendous draw against Wasps last week, they bring in Charlie Hodgson at fly-half, but rest wing Chris Ashton.

Fit the Falcons, Juan Pablo Orlandi and Kane Thompson cover for England prop Kieran Brookes and Italy lock Josh Furno.

Harlequins are scratching around for a change in form, but Franklin's Gardens is a tricky place to do it.

Quins have lost their last two Premiership games and are 10 points off the play-off places. A defeat tonight would make their post-season prospects pretty dim.

Leaders Saints have had mishaps at home this term though, losing to Exeter in November and getting thumped by Racing Metro last month.

But their win last week at second-placed Bath showed they are undeniably the most dominant Premiership force at the moment.

So there's been a bit of talk about promotion and relegation between the Premiership and Championship being scrapped.

It's only talk at the moment, but there's also the possibility of the Premiership expanding to 14 teams.

A good idea? Will it work? Let us know using #bbcrugby on Twitter

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We're keeping it in the family tonight, as two brothers face off against each other at scrum-half.

Quins number nine Karl Dickson, 32, will be staring into the whites of the eyes of his little sibling Lee.

Karl has 83 Premiership appearances to his name, but is overshadowed by Saints' Lee, who has 171 league games and 18 England caps - but I'm sure it never gets mentioned at the dinner table.

Come on then, let's hear what you have to say for yourselves.

Can Harlequins cause an upset? Are Northampton Saints on course for back-to-back title wins?

Whatever your thoughts, get them off your chest using #bbcrugby on Twitter.

Evening ladies and gents. In case you hadn't noticed, it's Friday, and I'm in love... with Premiership rugby!

Northampton Saints v Harlequins was probably not what Robert Smith of the Cure was getting at with his ode to the final day of the week, but who cares?

Tonight we'll preview all of the round-16 action, and bring you a blow-by-blow account of the action at Franklin's Gardens. It's good to have you with us.