I have just changed the content, look and site address for someones website. The domain is the same www.sccssurvey.co.uk its just the /hfkhkjf that has changed. Google search results still show the old details and obviuolsy the links don't work. Do I need to re-submit the site map or should I just wait for google to crawl the site again?
I would re-submit the site map, but if Google already 'knows' of your site then it should re-crawl it quite quickly. You can check crawling of your site by logging into your Google webmasters.