One of the Irish pub chains, this O'Neills is based on Goldhawk Road next to the Bush Empire Theatre and is a great place to catch a pint of Guiness before a gig or even see some music there as they have a live music night on Fridays.
Alternatively if you're a sports fan they haves all the big football and rugby matches screened on plasma TVs equipped with Sky, as well as proper pub grub served all day, such as fish and chips.