Undeveloped and unless there's any trademark issues (?), I'd say low to mid £xx (as long as getting a first page position is not impossible) but it doesn't seem the sort of phrase for people to randomly type in when looking to place a bet?
If you get it to rank in Top 5 of Google and start gaining some of this traffic it will be worth more of course (again TM aside)
I'd add a site and content, once listed and traffic starts arriving add some betting affiliate banners. Get traffic first, monetise and either use the recurring profit to rinse and repeat or resell based on earnings.