After using the Search Bar and then returning, for example to type the letter “a”, all previous searches starting with the letter “a” are displayed in a scroll down list. How can I delete this history when I wish to, to get rid of old search material that is no longer required.

You can fix this by turning off the Search Bar. You can do this by opening Internet Explorer then go to ‘Tools’ menu > ‘Internet Options’ and click the advanced tab. Scroll down the list until you see ‘Search from the Address Bar’. Under the sub-heading ‘When searching’ you will see three options. You can choose any of these four options but in your case I suggest that you click the option ‘Do not search from the Address Bar’ which will turn it off.