You can configure your browser to allow all cookies from www.rula.co.uk and the problem should be solved.
To configure Safari, do the following:
1. From the top menu, select Safari> Preferences
2. From the tabs at the top of the window, select Privacy
3. Make sure Only from site you navigate to is clicked
4. To save click the red button in the top left corner of this box
We hope this helps!
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