I use Firefox 3.5.5 and make use of the search bar at the extreme top right of the browser. By default mine goes to Google.com. I've found a Firefox addon for this, but it defaults at returning "pages from the UK" and not the more general UK index.
Does anyone know how I can just return the main Google UK index by using this search bar (i.e. shown when selecting "the web" in google.co.uk)