Easiest way is to either lift the back seats or boot carpet there will be an inspection plate for the fuel pump and level indicator undo that lift out the pump then sython from there saves knackering the pump from the lack of oil in the fuel

gonna have my kenneth,i would drain it given the amount you put in and what the mix would be if you brimmed it.the days of the ole cavs and escorts that would put up with it are gone in my opinion the modern engine has too many sensors and ecu,s and electrical contacts(sensor to computer detect petrol,computer"oooh scream like a girl and shutdown shutdown limp mode"then yer crawl around till yer replace a diode at£946.26 which all it did is control speed yer blinker flashed at
bloody ell i went on there abit didnt i 

There is another option as a very last resort, if the fuel pipe between the fuel filter and pump is flexible rubber, you could cut it to allow the pump to pump the fuel out into a container, then put a piece of copper or alloy tubing in between the cut section to re-join it, clamp it with jubilee clips.

Just fill it up with diesel dont pay £180 before Xmas or at any time 

Glad to hear you've sorted it, bit of a pain forking out that sort of money for it, but as you say, you're not likely to make the same mistake again.

did the same thing a few months ago - #10.00 petrol into astravan - so filled up with diesel , then kept topping up for the next few days( 600 miles) - no problems at all - normally green pump into green car , black into van