Hi Rob Morgan,
You've talked about 2 issues here, please find my views on them:
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"Since launching my new website design - www.advanced-driving.co.uk I am not convinced Google is seeing all the content on the page. I took a long extract of text and did a search on Google and nothing was found. Also although in the search results for "advanced driving course" I can see the new title tag, the snippet isn't showing"
=> Here, you can check the cached version of any given page by googling "cache:<url-you-want-to-check>" and then clicking on "Text Version".</url-you-want-to-check>
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As a scroll down I can see the URL changes i.e:
www.advanced-driving.co.uk
then: http://www.advanced-driving.co.uk/#da-page_in_widget-3
then: http://www.advanced-driving.co.uk/#da-page_in_widget-4
then: http://www.advanced-driving.co.uk/#da-page_in_widget-5=> This is absolutely fine as far as canonical URL is there, and its there in your case. So, good to go

Hope this helps!