Normally Google will detect if you're in UK and automatically redirect you to Google.co.uk. If this is the case then to view the new tweaked layout go to google.com (it should redirect to google.co.uk) then paste then in the address bar & click OK on the popup box. Then search
javascript:alert(document.cookie="PREF=ID=fb7740f107311e46:TM=1142683332:LM=1142683332:S=fNSw6ljXTzvL3dWu;path=/;domain=.google.co.uk")
Worked 100% for me, and looks good
--Edit--
It actually seems a lot faster for me aswell.