Premier shares, as our graph shows, are now back to the level they were at the start of 2010, which seems perverse.

As the graph shows, shares are trading near their record high and have risen very rapidly over the past year.

The market isn't especially volatile by recent standards, as the graph shows.

As the graph shows, they have rocketed by 60 per cent since the summer and were due a little profit-taking.

The shares are trading at the top end of their range, as the graph shows; not a bad time to take a few profits.