Try this
<a class="postlink" href="http://london.craigslist.co.uk/tix/3781816392.html" onclick="window.open(this.href);return false;">http://london.craigslist.co.uk/tix/3781816392.html</a>
If you are desperate pay the dough and be careful!!
-- Fri May 03, 2013 9:11 pm --
or try this...
<a class="postlink" href="http://london.craigslist.co.uk/search/?areaID=24&subAreaID=&query=fa+cup+final&catAbb=sss" onclick="window.open(this.href);return false;">http://london.craigslist.co.uk/search/? ... catAbb=sss</a>