Hello and welcome to our live coverage of the Premier League match between Chelsea and Arsenal at Stamford Bridge. Can Chelsea address their poor home form in this London derby?

Oscar gives Sagna a kick and the Arsenal defender is down on the turf in some pain.

Ramires threatens! Mata plays him in to the right and the midfielder jinks past the outstretched leg of Gibbs to get clear in the box. However, his finish is awful as he blasts the ball over the bar.

Nice build-up play from Arsenal but Walcott just strays offside as he gets in behind Cole.

A dismal first half for Arsenal, but a triumphant one for Chelsea. It already feels as though this is finished as a going concern.

Gorgeous pass over the top from Wilshere but Giroud can't quite pull the ball down and get a shot away as Ivanovic muscles him off the ball. Better from Arsenal though.

Arsenal try to break but Sagna gets his pass wrong for Walcott down the line. He is having a terrible game.

Arsenal getting done from all angles here. Mertesacker makes an important intervention though to prevent another cross from finding its target.

Walcott slips in Sagna but under pressure from Cole he can't get a clean cross away.

Ashley Cole loses Sagna at the back post and heads his header across goal, but can't find a Chelsea shirt. More poor defending from the right-back.

Azpilicueta plays in Mata down the right but Arsenal manage to head clear from his cross. The visitors are being completely overrun.

Fair to say this has been a rather humbling experience for Arsenal so far. They have been so poor in all departments.

Stat from Infostrada: "Lampard scored his 41st PL penalty. Only Alan Shearer (56) has scored more. "

Now it's Chelsea's turn to produce a terrible free-kick as Mata pumps one to the back post and above everyone's heads.

Arsenal waste another corner as Walcott chips it in for Cech, and Chelsea break with purpose before Szczesny does just enough to prevent Mata from inflicting more punishment.

Hazard fires in a low effort from inside the box but it's no problem for Szczesny.

An 'honourable' mention for Bacary Sagna, too, who was caught out for both goals. His form has evaporated over the past few weeks, which must be a real concern.

Either way, Arsenal are getting a right old hammering and it doesn't look like Chelsea will be letting up any time soon. The visitors have looked a shambles at the back and Diaby looks off the pace in midfield.

The marking from Arsenal was horrendous again as they allowed Ramires metres of space in the box. It looked like the Brazilian stuck his leg in to invite contact - but given it was awarded Szczesny was arguably lucky not to be sent off. He had two covering defenders, but it's surely a goalscoring opportunity?

GOAL! Chelsea 2-0 Arsenal! Lampard sticks it away to move to within seven goals of Bobby Tambling's club record of 202. Arsenal punished again.

Szczesny goes into the book for bringing down the midfielder as he tried to round him.

Penalty to Chelsea! Szczesny brings down Ramires!