Could you point me in the direction of a website/help/information around offering pre-designed accessible style sheets for websites?

There are a few websites that will provide you with different stylesheets and in particular ones that are deemed to be more accessible.

Firstly have a look at our Scottish RSC Inclusion Blog at http://www.scottish-rscs.org.uk/access/?page_id=6 and scroll down the page to the article entitled ‘Customising Internet Explorer for you and your learners’. This article will take you directly to our resources page which offers a range of resources including how to customise Internet Explorer so that it is accessible and easy-to-use. This resource provides a range of accessible stylesheets which you are free to download and use as required.

Follow this link to find out how to customise the settings to meet a range of visual preferences http://www.rsc-ne-scotland.ac.uk/colour_background/colour_background.html

If you prefer larger font or high contrast you can choose from a range of stylesheets which can be easily incorporated or attached to your browser. There are a number of stylesheets to choose from, for example, high contrast, large fonts etc.
http://www.rsc-ne-scotland.ac.uk/customising_explorer/stylesheet.html

You could also link to Zen Garden website which offers a range of style sheets. http://www.csszengarden.com%20/