If you don’t find it in the 1st week, you likely won’t
Time is critical. If its been taken today, then get off the forum, and drive around every scummy estate, shop and dodgy pub, ask about in a way like you want to buy it “some guy had a fancy green bike round here earlier, haven’t seen him have you, wanna buy it”…
Also bit of safety, take a burly mate, don’t do anything stupid, if their brave enough to rob it out of your house, their brave enough to pull a knife on you. Also don’t go trying to start a war, you’ll loose.
Same again tomorrow*, go around everywhere within 5miles, it WILL be someone local, some kid thats seen you ride it home, some geezer in a pub thats seen you and others when locking up for a pint, or worse, word of mouth thats escaped from one of your mates/family to some lower form of life who thought they’d have a go.
*this is how I found a mates bike in london, went into a deli one day, asked and nothing. Went back to same place next day, and sure enough the kid had been in asking if possible to put a sign up, which they had, and we found him.
Cycletaskforce are also worth a bash, they have helped recover stuff before, but not sure if they have any jurisdiction outside of the capital.
Lastly, keep an eye on http://bikeshd.co.uk/ its a site made by a german student (don’t quote me on that) that trawls all the usual places for bikes and flashs them up, its helped find dozens of stolen bikes in london, might be worth a look on the hour.