Readers of a previous column have asked how they can help.

Use memory strategies demonstrated in previous columns to remember what you wanted to buy.

The incorrect formula was also used in three previous columns:

In a previous column, you mentioned that it can be dangerous to feed grapes to dogs.

Unlike the previous two columns, this group does not refer to internal psychological attributes of a person.

I've asked this myself in previous columns about the dangers of big deal-making.

You may have read my previous column recommending books for children only a little older (www.telegraph.co.uk/education).

Perhaps inspired by Moore, I got a fact wrong in my previous column.

A previous column reported on the winners among television sets.

The affected passage should have appeared near the bottom of the previous column.